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HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
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<head>
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<title>Boost.Regex: POSIX-Extended Regular Expression Syntax</title>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<LINK href="../../../boost.css" type="text/css" rel="stylesheet"></head>
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<body>
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<P>
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<TABLE id="Table1" cellSpacing="1" cellPadding="1" width="100%" border="0">
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<TR>
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<td vAlign="top" width="300">
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<h3><A href="../../../index.htm"><IMG height="86" alt="C++ Boost" src="../../../boost.png" width="277" border="0"></A></h3>
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</td>
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<TD width="353">
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<H1 align="center">Boost.Regex</H1>
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<H2 align="center">POSIX-Extended Regular Expression Syntax</H2>
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</TD>
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<td width="50">
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<h3><A href="index.html"><IMG height="45" alt="Boost.Regex Index" src="uarrow.gif" width="43" border="0"></A></h3>
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</td>
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</TR>
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</TABLE>
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</P>
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<HR>
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<H3>Contents</H3>
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<dl class="index">
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<dt><A href="#synopsis">Synopsis</A> <dt><A href="#extended">POSIX Extended Syntax</A>
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<dt><A href="#variations">Variations</A>
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<dd>
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<dl>
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<dt><A href="#egrep">egrep</A> <dt><A href="#awk">awk</A> </dt>
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</dl>
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<dt><A href="#options">Options</A> <dt><A href="#refs">References</A></dt>
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</dl>
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<H3><A name="synopsis"></A>Synopsis</H3>
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<P>The POSIX-Extended regular expression syntax is supported by the POSIX C
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regular expression API's, and variations are used by the utilities <EM>egrep</EM>
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and <EM>awk</EM>. You can construct POSIX extended regular expressions in
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Boost.Regex by passing the flag <EM>extended</EM> to the regex constructor, for
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example:</P>
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<PRE>// e1 is a case sensitive POSIX-Extended expression:
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boost::regex e1(my_expression, boost::regex::extended);
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// e2 a case insensitive POSIX-Extended expression:
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boost::regex e2(my_expression, boost::regex::extended|boost::regex::icase);</PRE>
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<H3>POSIX Extended Syntax<A name="extended"></A></H3>
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<P>In POSIX-Extended regular expressions, all characters match themselves except
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for the following special characters:</P>
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<PRE>.[{()\*+?|^$</PRE>
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<H4>Wildcard:</H4>
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<P>The single character '.' when used outside of a character set will match any
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single character except:</P>
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<P>The NULL character when the flag <EM>match_no_dot_null</EM> is passed to the
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matching algorithms.</P>
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<P>The newline character when the flag <EM>match_not_dot_newline</EM> is passed to
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the matching algorithms.</P>
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<H4>Anchors:</H4>
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<P>A '^' character shall match the start of a line when used as the first
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character of an expression, or the first character of a sub-expression.</P>
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<P>A '$' character shall match the end of a line when used as the last character
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of an expression, or the last character of a sub-expression.</P>
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<H4>Marked sub-expressions:</H4>
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<P>A section beginning ( and ending ) acts as a marked sub-expression.
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Whatever matched the sub-expression is split out in a separate field by the
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matching algorithms. Marked sub-expressions can also repeated, or
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referred to by a back-reference.</P>
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<H4>Repeats:</H4>
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<P>Any atom (a single character, a marked sub-expression, or a character class)
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can be repeated with the *, +, ?, and {} operators.</P>
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<P>The * operator will match the preceding atom zero or more times, for example
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the expression a*b will match any of the following:</P>
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<PRE>b
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ab
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aaaaaaaab</PRE>
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<P>The + operator will match the preceding atom one or more times, for example the
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expression a+b will match any of the following:</P>
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<PRE>ab
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aaaaaaaab</PRE>
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<P>But will not match:</P>
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<PRE>b</PRE>
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<P>The ? operator will match the preceding atom zero or one times, for
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example the expression ca?b will match any of the following:</P>
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<PRE>cb
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cab</PRE>
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<P>But will not match:</P>
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<PRE>caab</PRE>
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<P>An atom can also be repeated with a bounded repeat:</P>
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<P>a{n} Matches 'a' repeated exactly <EM>n</EM> times.</P>
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<P>a{n,} Matches 'a' repeated <EM>n</EM> or more times.</P>
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<P>a{n, m} Matches 'a' repeated between <EM>n</EM> and <EM>m</EM> times
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inclusive.</P>
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<P>For example:</P>
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<PRE>^a{2,3}$</PRE>
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<P>Will match either of:</P>
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<PRE>aa
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aaa</PRE>
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<P>But neither of:</P>
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<PRE>a
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aaaa</PRE>
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<P>It is an error to use a repeat operator, if the preceding construct can not be
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repeated, for example:</P>
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<PRE>a(*)</PRE>
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<P>Will raise an error, as there is nothing for the * operator to be applied to.</P>
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<H4>Back references:</H4>
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<P>An escape character followed by a digit <EM>n</EM>, where <EM>n </EM>is in the
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range 1-9, matches the same string that was matched by sub-expression <EM>n</EM>.
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For example the expression:</P>
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<PRE>^(a*).*\1$</PRE>
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<P>Will match the string:</P>
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<PRE>aaabbaaa</PRE>
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<P>But not the string:</P>
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<PRE>aaabba</PRE>
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<P><EM><STRONG>Caution</STRONG>: the POSIX standard does not support back-references
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for "extended" regular expressions, this is a compatible extension to that
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standard.</EM></P>
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<H4>Alternation</H4>
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<P>The | operator will match either of its arguments, so for example: abc|def will
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match either "abc" or "def".
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</P>
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<P>Parenthesis can be used to group alternations, for example: ab(d|ef) will match
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either of "abd" or "abef".</P>
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<H4>Character sets:</H4>
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<P>A character set is a bracket-expression starting with [ and ending with ], it
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defines a set of characters, and matches any single character that is a member
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of that set.</P>
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<P>A bracket expression may contain any combination of the following:</P>
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<BLOCKQUOTE dir="ltr" style="MARGIN-RIGHT: 0px">
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<H5>Single characters:</H5>
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<P>For example [abc], will match any of the characters 'a', 'b', or 'c'.</P>
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<H5>Character ranges:</H5>
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<P>For example [a-c] will match any single character in the range 'a' to
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'c'. By default, for POSIX-Extended regular expressions, a character <EM>x</EM>
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is within the range <EM>y</EM> to <EM>z</EM>, if it collates within that
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range; <EM><STRONG>this results in locale specific behavior</STRONG></EM> .
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This behavior can be turned off by unsetting the <EM><A href="syntax_option_type.html#extended">
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collate</A></EM> option flag - in which case whether a character appears
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within a range is determined by comparing the code points of the characters
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only.</P>
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<H5>Negation:</H5>
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<P>If the bracket-expression begins with the ^ character, then it matches the
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complement of the characters it contains, for example [^a-c] matches any
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character that is not in the range a-c.</P>
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<H5>Character classes:</H5>
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<P>An expression of the form [[:name:]] matches the named character class "name",
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for example [[:lower:]] matches any lower case character. See <A href="character_class_names.html">
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character class names</A>.</P>
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<H5>Collating Elements:</H5>
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<P>An expression of the form [[.col.] matches the collating element <EM>col</EM>.
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A collating element is any single character, or any sequence of characters that
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collates as a single unit. Collating elements may also be used as the end
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point of a range, for example: [[.ae.]-c] matches the character sequence "ae",
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plus any single character in the range "ae"-c, assuming that "ae" is treated as
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a single collating element in the current locale.</P>
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<P>Collating elements may be used in place of escapes (which are not normally
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allowed inside character sets), for example [[.^.]abc] would match either one
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of the characters 'abc^'.</P>
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<P>As an extension, a collating element may also be specified via its <A href="collating_names.html">
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symbolic name</A>, for example:</P>
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<P>[[.NUL.]]</P>
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<P>matches a NUL character.</P>
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<H5>Equivalence classes:</H5>
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<P>
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An expression oftheform[[=col=]], matches any character or collating element
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whose primary sort key is the same as that for collating element <EM>col</EM>,
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as with colating elements the name <EM>col</EM> may be a <A href="collating_names.html">
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symbolic name</A>. A primary sort key is one that ignores case,
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accentation, or locale-specific tailorings; so for example [[=a=]] matches any
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of the characters: a, <20>, <20>, <20>, <20>, <20>, <20>, A, <20>, <20>, <20>, <20>, <20> and <20>.
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Unfortunately implementation of this is reliant on the platform's collation and
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localisation support; this feature can not be relied upon to work portably
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across all platforms, or even all locales on one platform.</P>
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</BLOCKQUOTE>
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<H5>Combinations:</H5>
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<P>All of the above can be combined in one character set declaration, for example:
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[[:digit:]a-c[.NUL.]].</P>
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<H4>Escapes</H4>
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<P>The POSIX standard defines no escape sequences for POSIX-Extended regular
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expressions, except that:</P>
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<UL>
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<LI>
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Any special character preceded by an escape shall match itself.
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<LI>
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The effect of any ordinary character being preceded by an escape is undefined.
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<LI>
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An escape inside a character class declaration shall match itself: in other
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words the escape character is not "special" inside a character class
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declaration; so [\^] will match either a literal '\' or a '^'.</LI></UL>
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<P>However, that's rather restrictive, so the following standard-compatible
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extensions are also supported by Boost.Regex:</P>
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<BLOCKQUOTE dir="ltr" style="MARGIN-RIGHT: 0px">
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<H5>Escapes matching a specific character</H5>
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<P>The following escape sequences are all synonyms for single characters:</P>
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<P>
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<TABLE id="Table7" cellSpacing="1" cellPadding="1" width="100%" border="1">
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<TR>
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<TD><STRONG>Escape</STRONG></TD>
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<TD><STRONG>Character</STRONG></TD>
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</TR>
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<TR>
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<TD>\a</TD>
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<TD>'\a'</TD>
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</TR>
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<TR>
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<TD>\e</TD>
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<TD>0x1B</TD>
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</TR>
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<TR>
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<TD>\f</TD>
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<TD>\f</TD>
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</TR>
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<TR>
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<TD>\n</TD>
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<TD>\n</TD>
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</TR>
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<TR>
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<TD>\r</TD>
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<TD>\r</TD>
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</TR>
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<TR>
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<TD>\t</TD>
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<TD>\t</TD>
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</TR>
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<TR>
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<TD>\v</TD>
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<TD>\v</TD>
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</TR>
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<TR>
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<TD>\b</TD>
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<TD>\b (but only inside a character class declaration).</TD>
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</TR>
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<TR>
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<TD>\cX</TD>
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<TD>An ASCII escape sequence - the character whose code point is X % 32</TD>
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</TR>
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<TR>
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<TD>\xdd</TD>
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<TD>A hexadecimal escape sequence - matches the single character whose code point
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is 0xdd.</TD>
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</TR>
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<TR>
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<TD>\x{dddd}</TD>
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<TD>A hexadecimal escape sequence - matches the single character whose code point
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is 0xdddd.</TD>
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</TR>
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<TR>
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<TD>\0ddd</TD>
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<TD>An octal escape sequence - matches the single character whose code point is
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0ddd.</TD>
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</TR>
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<TR>
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<TD>\N{Name}</TD>
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<TD>Matches the single character which has the <A href="collating_names.html">symbolic
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name</A> <EM>name. </EM>For example \N{newline} matches the single
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character \n.</TD>
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</TR>
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</TABLE>
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</P>
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<H5>"Single character" character classes:</H5>
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<P>Any escaped character <EM>x</EM>, if <EM>x</EM> is the name of a character
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class shall match any character that is a member of that class, and any escaped
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character <EM>X</EM>, if <EM>x</EM> is the name of a character class, shall
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match any character not in that class.</P>
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<P>The following are supported by default:</P>
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<P>
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<TABLE id="Table3" cellSpacing="1" cellPadding="1" width="300" border="1">
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<TR>
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<TD><STRONG>Escape sequence</STRONG></TD>
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<TD><STRONG>Equivalent to</STRONG></TD>
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</TR>
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<TR>
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<TD>\d</TD>
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<TD>[[:digit:]]</TD>
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</TR>
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<TR>
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<TD>\l</TD>
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<TD>[[:lower:]]</TD>
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</TR>
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<TR>
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<TD>\s</TD>
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<TD>[[:space:]]</TD>
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</TR>
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<TR>
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<TD>\u</TD>
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<TD>[[:upper:]]</TD>
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</TR>
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<TR>
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<TD>\w</TD>
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<TD>[[:word:]]</TD>
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</TR>
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<TR>
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<TD>\D</TD>
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<TD>[^[:digit:]]</TD>
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</TR>
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<TR>
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<TD>\L</TD>
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<TD>[^[:lower:]]</TD>
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</TR>
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<TR>
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<TD>\S</TD>
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<TD>[^[:space:]]</TD>
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</TR>
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<TR>
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<TD>\U</TD>
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<TD>[^[:upper:]]</TD>
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</TR>
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<TR>
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<TD>\W</TD>
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<TD>[^[:word:]]</TD>
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</TR>
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</TABLE>
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</P>
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<H5>
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<H5>Character Properties</H5>
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</H5>
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<P dir="ltr">The character property names in the following table are all
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equivalent to the <A href="character_class_names.html">names used in character
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classes</A>.</P>
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<H5>
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<TABLE id="Table9" cellSpacing="1" cellPadding="1" width="100%" border="0">
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<TR>
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<TD><STRONG>Form</STRONG></TD>
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<TD><STRONG>Description</STRONG></TD>
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<TD><STRONG>Equivalent character set form</STRONG></TD>
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</TR>
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<TR>
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<TD>\pX</TD>
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<TD>Matches any character that has the property X.</TD>
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<TD>[[:X:]]</TD>
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</TR>
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<TR>
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<TD>\p{Name}</TD>
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<TD>Matches any character that has the property <EM>Name</EM>.</TD>
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<TD>[[:Name:]]</TD>
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</TR>
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<TR>
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<TD>\PX</TD>
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<TD>Matches any character that does not have the property X.</TD>
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<TD>[^[:X:]]</TD>
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</TR>
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<TR>
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<TD>\P{Name}</TD>
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<TD>Matches any character that does not have the property <EM>Name</EM>.</TD>
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<TD>[^[:Name:]]</TD>
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</TR>
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</TABLE>
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</H5>
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<H5>Word Boundaries</H5>
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<P>The following escape sequences match the boundaries of words:</P>
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<P>
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<TABLE id="Table4" cellSpacing="1" cellPadding="1" width="100%" border="1">
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<TR>
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<TD>\<</TD>
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<TD>Matches the start of a word.</TD>
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</TR>
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<TR>
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<TD>\></TD>
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<TD>Matches the end of a word.</TD>
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</TR>
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<TR>
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<TD>\b</TD>
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<TD>Matches a word boundary (the start or end of a word).</TD>
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</TR>
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<TR>
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<TD>\B</TD>
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<TD>Matches only when not at a word boundary.</TD>
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</TR>
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</TABLE>
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</P>
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<H5>Buffer boundaries</H5>
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<P>The following match only at buffer boundaries: a "buffer" in this context is
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the whole of the input text that is being matched against (note that ^ and
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$ may match embedded newlines within the text).</P>
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<P>
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<TABLE id="Table5" cellSpacing="1" cellPadding="1" width="100%" border="1">
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<TR>
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<TD>\`</TD>
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<TD>Matches at the start of a buffer only.</TD>
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</TR>
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<TR>
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<TD>\'</TD>
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<TD>Matches at the end of a buffer only.</TD>
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</TR>
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<TR>
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<TD>\A</TD>
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<TD>Matches at the start of a buffer only (the same as \`).</TD>
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</TR>
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<TR>
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<TD>\z</TD>
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<TD>Matches at the end of a buffer only (the same as \').</TD>
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</TR>
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<TR>
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<TD>\Z</TD>
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<TD>Matches an optional sequence of newlines at the end of a buffer: equivalent to
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the regular expression \n*\z</TD>
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</TR>
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</TABLE>
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</P>
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<H5>Continuation Escape</H5>
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<P>The sequence \G matches only at the end of the last match found, or at the
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start of the text being matched if no previous match was found. This
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escape useful if you're iterating over the matches contained within a text, and
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you want each subsequence match to start where the last one ended.</P>
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<H5>Quoting escape</H5>
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<P>The escape sequence \Q begins a "quoted sequence": all the subsequent
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characters are treated as literals, until either the end of the regular
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expression or \E is found. For example the expression: \Q\*+\Ea+ would
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match either of:</P>
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<PRE>\*+a<BR>\*+aaa</PRE>
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<H5>Unicode escapes</H5>
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<P>
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<TABLE id="Table6" cellSpacing="1" cellPadding="1" width="100%" border="1">
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<TR>
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<TD>\C</TD>
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<TD>Matches a single code point: in Boost regex this has exactly the same effect
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as a "." operator.</TD>
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</TR>
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<TR>
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<TD>\X</TD>
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<TD>Matches a combining character sequence: that is any non-combining character
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followed by a sequence of zero or more combining characters.</TD>
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</TR>
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</TABLE>
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</P>
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<H5>Any other escape</H5>
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<P>Any other escape sequence matches the character that is escaped, for example \@
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matches a literal <A href="mailto:'@'">'@'</A>.</P>
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||
</BLOCKQUOTE><A name="variations">
|
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<H4>Operator precedence</H4>
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<P> The order of precedence for of operators is as shown in the following
|
||
table:</P>
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<P>
|
||
<TABLE id="Table2" cellSpacing="1" cellPadding="1" width="100%" border="1">
|
||
<TR>
|
||
<TD>Collation-related bracket symbols</TD>
|
||
<TD>[==] [::] [..]</TD>
|
||
</TR>
|
||
<TR>
|
||
<TD>Escaped characters
|
||
</TD>
|
||
<TD>\</TD>
|
||
</TR>
|
||
<TR>
|
||
<TD>Character set (bracket expression)
|
||
</TD>
|
||
<TD>[]</TD>
|
||
</TR>
|
||
<TR>
|
||
<TD>Grouping</TD>
|
||
<TD>()</TD>
|
||
</TR>
|
||
<TR>
|
||
<TD>Single-character-ERE duplication
|
||
</TD>
|
||
<TD>* + ? {m,n}</TD>
|
||
</TR>
|
||
<TR>
|
||
<TD>Concatenation</TD>
|
||
<TD></TD>
|
||
</TR>
|
||
<TR>
|
||
<TD>Anchoring</TD>
|
||
<TD>^$</TD>
|
||
</TR>
|
||
<TR>
|
||
<TD>Alternation</TD>
|
||
<TD>|</TD>
|
||
</TR>
|
||
</TABLE>
|
||
</P>
|
||
</A>
|
||
<H4>What Gets Matched</H4>
|
||
<P>When there is more that one way to match a regular expression, the "best"
|
||
possible match is obtained using the <A href="syntax_leftmost_longest.html">leftmost-longest
|
||
rule</A>.</P>
|
||
<H3>Variations</H3>
|
||
<H4>Egrep<A name="egrep"></H4>
|
||
<P>When an expression is compiled with the flag <EM>egrep</EM> set, then the
|
||
expression is treated as a newline separated list of POSIX-Extended
|
||
expressions, a match is found if any of the expressions in the list match, for
|
||
example:</P>
|
||
<PRE>boost::regex e("abc\ndef", boost::regex::egrep);</PRE>
|
||
<P>will match either of the POSIX-Basic expressions "abc" or "def".</P>
|
||
<P>As its name suggests, this behavior is consistent with the Unix utility <EM>egrep</EM>,
|
||
and with <EM>grep</EM> when used with the -E option.</P>
|
||
<H4>awk<A name="awk"></A></H4>
|
||
<P>In addition to the <A href="#extended">POSIX-Extended features</A> the
|
||
escape character is special inside a character class declaration. </P>
|
||
<P>In addition, some escape sequences that are not defined as part of
|
||
POSIX-Extended specification are required to be supported - however Boost.Regex
|
||
supports these by default anyway.</P>
|
||
<H3><A name="options"></A>Options</H3>
|
||
<P>There are a <A href="syntax_option_type.html#extended">variety of flags</A> that
|
||
may be combined with the <EM>extended</EM> and <EM>egrep</EM> options when
|
||
constructing the regular expression, in particular note that the <A href="syntax_option_type.html#extended">
|
||
newline_alt</A> option alters the syntax, while the <A href="syntax_option_type.html#extended">
|
||
collate, nosubs and icase</A> options modify how the case and locale
|
||
sensitivity are to be applied.</P>
|
||
<H3><A name="refs">References</H3>
|
||
<P><A href="http://www.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap09.html"> IEEE
|
||
Std 1003.1-2001, Portable Operating System Interface (POSIX ), Base Definitions
|
||
and Headers, Section 9, Regular Expressions.</A></P>
|
||
<P><A href="http://www.opengroup.org/onlinepubs/000095399/utilities/grep.html"> IEEE
|
||
Std 1003.1-2001, Portable Operating System Interface (POSIX ), Shells and
|
||
Utilities, Section 4, Utilities, egrep.</A></P>
|
||
<P><A href="http://www.opengroup.org/onlinepubs/000095399/utilities/awk.html">IEEE
|
||
Std 1003.1-2001, Portable Operating System Interface (POSIX ), Shells and
|
||
Utilities, Section 4, Utilities, awk.</A></P>
|
||
<HR>
|
||
<P></P>
|
||
<p>Revised
|
||
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
|
||
21 Aug 2004
|
||
<!--webbot bot="Timestamp" endspan i-checksum="39359" --></p>
|
||
<P><I><EFBFBD> Copyright <a href="mailto:jm@regex.fsnet.co.uk">John Maddock</a> 2004</I></P>
|
||
<I>
|
||
<P><I>Use, modification and distribution are subject to the Boost Software License,
|
||
Version 1.0. (See accompanying file <A href="../../../LICENSE_1_0.txt">LICENSE_1_0.txt</A>
|
||
or copy at <A href="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</A>).</I></P>
|
||
</I>
|
||
</body>
|
||
</html>
|