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Re: Named capture backreferences cannot be used in character classes?

by moritz (Cardinal)
on Sep 26, 2013 at 17:38 UTC ( #1055870=note: print w/replies, xml ) Need Help??


in reply to Named capture backreferences cannot be used in character classes?

One workaround is to use a negative look-ahead plus a dot instead of a negated character class:

use strict; use warnings; use 5.010; for (qw/'abc' "abc" 'abc"/) { if (/(?<FQ>['"])(?<content>(?:(?!\k<FQ>).)+)\k<FQ>/s) { say $+{content}; } else { say "Not matched: $_"; } } __END__ abc abc Not matched: 'abc"
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Re^2: Named capture backreferences cannot be used in character classes?
by BrowserUk (Pope) on Sep 26, 2013 at 17:45 UTC

    Perfect. Thank you.


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Re^2: Named capture backreferences cannot be used in character classes?
by Anonymous Monk on Sep 26, 2013 at 22:49 UTC

    Probably not worth it, but fewer negative look-aheads:

    my $re = qr/ (?<FQ>['"]) # Capture starting quote. (?<content> # Capture content. (?: (?>[^'"]*) # Match non-quotes, don't backtrack. (?(?!\k<FQ>).) # Match opposite quote. )* # Repeat. ) \k<FQ> # Match ending quote. /x;

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