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Perl: the Markov chain saw

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I have a mechanism for you. Right now, it requires that you break your regex up into pieces yourself, but once I have Regexp::Parser completed, this mechanism will be available via Regexp::Parser::Fuzzy.

It tries to be smart, making sure that when it does an "insert", it's not inserting the next thing it was supposed to match anyway (I don't think that breaks anything), and that when it does a "modify", it doesn't match the thing it was supposed to try to match.

Also, right now, it just prints the matches. If you tell me this program does what you need it to do, then I'll help make it more useful. If the regex is something that you don't have control over (that is, it's user input), then you're going to need a regex parser to help you split it up...

my $rx = mk_fuzzy(0, 1, 0, qw( p e r l )); "pearl" =~ $rx; # mk_fuzzy(MODs, INSs, DELs, parts...) sub mk_fuzzy { our ($m, $i, $d) = splice @_, 0, 3; use re 'eval'; qr{ (?{ [ $i, $d, $m ] }) ^ @{[ map qq{ (?: $_[$_] (?: | (?(?{ \$^R->[0] }) @{[ $_ < $#_ and "(?! $_[$_+1] + )" ]} (?s: . ) (?{ [ \$^R->[0] - 1, \$^R->[1], \$^R->[2] ] }) | (?!) + ) ) | (?(?{ \$^R->[1] }) (?{ [ \$^R->[0], \$^R->[1] - 1, \$^R->[2] + ] }) | (?!) ) | (?(?{ \$^R->[2] }) (?! $_[$_] ) (?s: . ) (?{ [ \$^R->[0], \$ +^R->[1], \$^R->[2] - 1 ] }) | (?!) ) ) }, 0 .. $#_ ]} $ (?{ printf ">> %s (M=%d/%d, I=%d/%d, D=%d/%d)\n", $&, $m-$^R->[2], + $m, $i-$^R->[0], $i, $d-$^R->[1], $d }) (?!) }x; }
Jeff[japhy]Pinyan: Perl, regex, and perl hacker, who'd like a job (NYC-area)
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;

In reply to Re^2: non-exact regexp matches by japhy
in thread non-exact regexp matches by vinforget

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