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Re: Matching backslash in regexp negative lookbehind

by AnomalousMonk (Chancellor)
on Jan 02, 2018 at 21:41 UTC ( #1206561=note: print w/replies, xml ) Need Help??


in reply to Matching backslash in regexp negative lookbehind

Here's a single-pass alternative to this (uses the same test-vector set):

BEGIN { my %mask = ( q{"} => q{"***"}, q{'} => q{'***'}, ); my $connector = qr{ => | : }xms; sub elide { my ($key, # pattern: arm sensitive sub-string elision $string, ) = @_; $string =~ s{ ((?<! \\) ['"]) $key \g-1 \s* $connector \s* \K \g-1 ((?! \g-2 | \\) .)* (?: \\. (?2)*)* \g-2 } {$mask{$1}}xmsg; return $string; } } # end BEGIN block
Whether this variation is preferable is very much a matter of taste. The  BEGIN block is required so that certain scalars | lexicals (the  %mask hash in particular,  $connector not so much since it could easily be inlined) will be guaranteed to be properly initialized. Very much dependent on 5.10 regex extensions.


Give a man a fish:  <%-{-{-{-<

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