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Re: Deriving Regular Expressions

by I0 (Priest)
on Apr 19, 2002 at 05:38 UTC ( #160439=note: print w/ replies, xml ) Need Help??


in reply to Deriving Regular Expressions

# my favorite cause for generating regexes from strings is to match balanced text:

$_ = "sin(atan2(sin(1),cos(1))),atan2(1,1),cos(atan2(sin(2),cos(2)))\n +"; (my $re=$_)=~s/((\()|(\))|.)/${[')','']}[!$3]\Q$1\E${['(','']}[!$2]/gs +; $re= join'|',map{quotemeta}eval{/$re/}; die $@ if $@ =~ /unmatched/; print while s/(\w+\(($re)\))/$1/ee;


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