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Added possessive modifiers ++ *+ ?+ {}+.

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Added support for \v and \h as character classes as per Perl-5.10. 

[SVN r52558]
This commit is contained in:
John Maddock
2009-04-23 09:51:31 +00:00
parent ccf465daac
commit 7b10b5dac5
96 changed files with 521 additions and 286 deletions
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21
doc/syntax_perl.qbk
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@ -143,6 +143,23 @@ consume as little input as possible while still producing a match.
`{n,m}?` Matches the previous atom between n and m times, while
consuming as little input as possible.
[h4 Pocessive repeats]
By default when a repeated patten does not match then the engine will backtrack until
a match is found. However, this behaviour can sometime be undesireable so there are
also "pocessive" repeats: these match as much as possible and do not then allow
backtracking if the rest of the expression fails to match.
`*+` Matches the previous atom zero or more times, while giving nothing back.
`++` Matches the previous atom one or more times, while giving nothing back.
`?+` Matches the previous atom zero or one times, while giving nothing back.
`{n,}+` Matches the previous atom n or more times, while giving nothing back.
`{n,m}+` Matches the previous atom between n and m times, while giving nothing back.
[h4 Back references]
An escape character followed by a digit /n/, where /n/ is in the range 1-9,
@ -296,11 +313,15 @@ The following are supported by default:
[[`\s`][`[[:space:]]`]]
[[`\u`][`[[:upper:]]`]]
[[`\w`][`[[:word:]]`]]
[[`\h`][Horizontal whitespace]]
[[`\v`][Vertical whitespace]]
[[`\D`][`[^[:digit:]]`]]
[[`\L`][`[^[:lower:]]`]]
[[`\S`][`[^[:space:]]`]]
[[`\U`][`[^[:upper:]]`]]
[[`\W`][`[^[:word:]]`]]
[[`\H`][Not Horizontal whitespace]]
[[`\V`][Not Vertical whitespace]]
]
[h5 Character Properties]