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Home: Perl Programming Help: Frequently Asked Questions:
Can I use Perl regular expressions to match balanc

 



Jasmine
Administrator

Mar 15, 2001, 6:03 AM

Post #1 of 1 (22217 views)
Can I use Perl regular expressions to match balanc Can't Post

Can I use Perl regular expressions to match balanced text?

Although Perl regular expressions are more powerful than ``mathematical'' regular expressions, because they feature conveniences like backreferences (\1 and its ilk), they still aren't powerful enough. You still need to use non-regexp techniques to parse balanced text, such as the text enclosed between matching parentheses or braces, for example.

An elaborate subroutine (for 7-bit ASCII only) to pull out balanced and possibly nested single chars, like ` and ', { and }, or ( and ) can be found in http://www.perl.com/CPAN/authors/id/TOMC/scripts/pull_quotes.gz .

The C::Scan module from CPAN contains such subs for internal usage, but they are undocumented.



 
 


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