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Re: Patter Finding

by nardo (Friar)
on Sep 11, 2001 at 06:21 UTC ( #111651=note: print w/ replies, xml ) Need Help??


in reply to Pattern Finding

The pattern /^(.+?)\1*(.+?)(?:\1|\2)*(.+?)(?:\1|\2|\3)+$/ will find the three patterns and put them in $1, $2, and $3. You can use a function to build this regex:

sub findpattern { my $data = shift; my $num = shift; my $re; my $i; my @retval; $re = '^'; for($i = 1; $i <= $num; $i++) { $re .= '(.+?)(?:'.join('|', map("\\$_", 1..$i)).')'; if($i == $num) { $re .= '+'; } else { $re .= '*'; } } $re .= '$'; if($data =~ /$re/) { for($i = 1; $i <= $num; $i++) { push(@retval, ${$i}); } return @retval; } return undef; }
If passed the data and the number of patterns it will return a list of the patterns or undef if unable to find them (at least one pattern must be repeated more than once).


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