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Add support for named sub-expressions.

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[SVN r52823]
This commit is contained in:
John Maddock
2009-05-07 09:46:51 +00:00
parent 30941e330d
commit 55d979060c
49 changed files with 1287 additions and 206 deletions
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13
doc/format_perl_syntax.qbk
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@ -17,13 +17,24 @@ should be sent to output as follows:
[table
[[Placeholder][Meaning]]
[[$&][Outputs what matched the whole expression.]]
[[$`][Outputs the text between the end of the last match found (or the
[[$MATCH][As $&]]
[[${^MATCH}][As $&]]
[[$\`][Outputs the text between the end of the last match found (or the
start of the text if no previous match was found), and the start
of the current match.]]
[[$PREMATCH][As $\`]]
[[${^PREMATCH}][As $\`]]
[[$'][Outputs all the text following the end of the current match.]]
[[$POSTMATCH][As $']]
[[${^POSTMATCH}][As $']]
[[$+][Outputs what matched the last marked sub-expression in the regular expression.]]
[[$LAST_PAREN_MATCH][As $+]]
[[$LAST_SUBMATCH_RESULT][Outputs what matched the last sub-expression to be actually matched.]]
[[$^N][As $LAST_SUBMATCH_RESULT]]
[[$$][Outputs a literal '$']]
[[$n][Outputs what matched the n'th sub-expression.]]
[[${n}][Outputs what matched the n'th sub-expression.]]
[[$+{NAME}][Outputs whatever matched the sub-expression named "NAME".]]
]
Any $-placeholder sequence not listed above, results in '$' being treated