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jzmaddock
2015-10-05 19:13:04 +01:00
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@ -1361,8 +1361,51 @@
from elsewhere in the pattern.
</li>
</ul></div>
<h5>
<h6>
<a name="boost_regex.syntax.perl_syntax.h42"></a>
<span class="phrase"><a name="boost_regex.syntax.perl_syntax.backtracking_control_verbs"></a></span><a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.backtracking_control_verbs">Backtracking
Control Verbs</a>
</h6>
<p>
This library has partial support for Perl's backtracking control verbs, in
particular (*MARK) is not supported. There may also be detail differences
in behaviour between this library and Perl, not least because Perl's behaviour
is rather under-documented and often somewhat random in how it behaves in
practice. The verbs supported are:
</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
<code class="literal">(*PRUNE)</code> Has no effect unless backtracked onto, in
which case all the backtracking information prior to this point is discarded.
</li>
<li class="listitem">
<code class="literal">(*SKIP)</code> Behaves the same as <code class="literal">(*PRUNE)</code>
except that it is assumed that no match can possibly occur prior to the
current point in the string being searched. This can be used to optimize
searches by skipping over chunks of text that have already been determined
can not form a match.
</li>
<li class="listitem">
<code class="literal">(*THEN)</code> Has no effect unless backtracked onto, in
which case all subsequent alternatives in a group of alternations are
discarded.
</li>
<li class="listitem">
<code class="literal">(*COMMIT)</code> Has no effect unless backtracked onto, in
which case all subsequent matching/searching attempts are abandoned.
</li>
<li class="listitem">
<code class="literal">(*FAIL)</code> Causes the match to fail unconditionally at
this point, can be used to force the engine to backtrack.
</li>
<li class="listitem">
<code class="literal">(*ACCEPT)</code> Causes the pattern to be considered matched
at the current point. Any half-open sub-expressions are closed at the
current point.
</li>
</ul></div>
<h5>
<a name="boost_regex.syntax.perl_syntax.h43"></a>
<span class="phrase"><a name="boost_regex.syntax.perl_syntax.operator_precedence"></a></span><a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.operator_precedence">Operator
precedence</a>
</h5>
@ -1397,7 +1440,7 @@
</li>
</ol></div>
<h4>
<a name="boost_regex.syntax.perl_syntax.h43"></a>
<a name="boost_regex.syntax.perl_syntax.h44"></a>
<span class="phrase"><a name="boost_regex.syntax.perl_syntax.what_gets_matched"></a></span><a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.what_gets_matched">What
gets matched</a>
</h4>
@ -1573,7 +1616,7 @@
</tbody>
</table></div>
<h4>
<a name="boost_regex.syntax.perl_syntax.h44"></a>
<a name="boost_regex.syntax.perl_syntax.h45"></a>
<span class="phrase"><a name="boost_regex.syntax.perl_syntax.variations"></a></span><a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.variations">Variations</a>
</h4>
<p>
@ -1582,7 +1625,7 @@
and <code class="literal">JScript</code></a> are all synonyms for <code class="literal">perl</code>.
</p>
<h4>
<a name="boost_regex.syntax.perl_syntax.h45"></a>
<a name="boost_regex.syntax.perl_syntax.h46"></a>
<span class="phrase"><a name="boost_regex.syntax.perl_syntax.options"></a></span><a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.options">Options</a>
</h4>
<p>
@ -1594,7 +1637,7 @@
are to be applied.
</p>
<h4>
<a name="boost_regex.syntax.perl_syntax.h46"></a>
<a name="boost_regex.syntax.perl_syntax.h47"></a>
<span class="phrase"><a name="boost_regex.syntax.perl_syntax.pattern_modifiers"></a></span><a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.pattern_modifiers">Pattern
Modifiers</a>
</h4>
@ -1606,7 +1649,7 @@
and <code class="literal">no_mod_s</code></a>.
</p>
<h4>
<a name="boost_regex.syntax.perl_syntax.h47"></a>
<a name="boost_regex.syntax.perl_syntax.h48"></a>
<span class="phrase"><a name="boost_regex.syntax.perl_syntax.references"></a></span><a class="link" href="perl_syntax.html#boost_regex.syntax.perl_syntax.references">References</a>
</h4>
<p>