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Here's one way to do it, given an input string such as 'abcde'. The program tries matching the one-character substring, then the two-character substring, and so on until it fails to match or the entire input string has been matched.
#!/usr/local/bin/perl -w use strict; print "Name of file containing various random strings?\n"; chomp (my $file = <STDIN>); open (MOTIF, "$file") || die "$!"; print "String to search with?\n"; chomp (my $blocks = <STDIN>); my $motif; { local $/; $motif = <MOTIF>; } my $i = 1; my $re = substr($blocks, 0, $i); while ($i <= length $blocks and $motif =~ /\Q$re/) { $re = substr($blocks, 0, ++$i); } chop $re if $i <= length $blocks; print "$re\n";
To handle an input string like '(a|b)(b|c)(c|d|e)', you could use a similar approach, perhaps storing the possible characters for each position in an array of arrays, and iterating over each sub-array to construct the regexes.

In reply to Re: Progressive pattern matching by chipmunk
in thread Progressive pattern matching by Anonymous Monk

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