3 ms·
> I wonder if they used a regex for that? Not possible. You have to parse the file fully to extract that information; regular expressions aren't powerful enoug
by Resident_Geek 15y ago
> I wonder if they used a regex for that?
Not possible. You have to parse the file fully to extract that information; regular expressions aren't powerful enough.
- bad_user 15y agoIt depends on what you mean by regex. Modern engines go beyond the capabilities of regular expression grammars, describing things that are not possible with a finite-state machine. And for example, the regex engine from Perl 5.10 and up has had support for recursive patterns. See the faq: http://perldoc.perl.org/perlfaq6.html#Can-I-use-Perl-regular-expressions-to-match-balanced-text%3F http://perldoc.perl.org/perlfaq6.html#Can-I-use-Perl-regular... And once you have recursion support, you can parse context-free languages.