Re^2: Regex KungFu help needed

You can put the whole term in the look-ahead to make things a bit simpler and you could take advantage of the $scalar = () = $string =~ m{$pattern}g; idiom rather than successive incrementing, wrapping the whole thing in a map.

$ perl -Mstrict -wle '
> my $seq  = q{GGGGGGGAGAAAAAAAAAAAAAAAGAAGGA};
> my @pats = qw{ AAAAA GGGGG GGAGA GAAGG };
> my @cts  = map {
>    my $re = qr{(?=\Q$_\E)};
>    my $ct = () = $seq =~ m{$re}g;
>    } @pats;
> print qq{@cts};'
11 3 1 1
$
[download]

I hope this is of interest.

Cheers,

JohnGG

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Re^3: Regex KungFu help needed by AnomalousMonk (Archbishop) on Oct 02, 2009 at 22:59 UTC
As a further step, associating patterns with their counts and (cached) regex objects in a hash may be worthwhile: `>perl -wMstrict -le "my $sequence = 'GGGGGGGAGAAAAAAAAAAAAAAAGAAGGA'; my %patterns = map { $_ => { count => 0, regex => qr{ (?= \Q$_\E) }xms } } qw(AAAAA GGGGG GGAGA GAAGG) ; $patterns{$_}{count} =()= $sequence =~ m{ $patterns{$_}{regex} }xmsg for keys %patterns; print qq{$_: $patterns{$_}{count}} for sort keys %patterns; " AAAAA: 11 GAAGG: 1 GGAGA: 1 GGGGG: 3` [download] or `>perl -wMstrict -le "my $sequence = 'GGGGGGGAGAAAAAAAAAAAAAAAGAAGGA'; my %patterns = map { $_ => { count => 0, regex => qr{ (?= \Q$_\E) }xms } } qw(AAAAA GGGGG GGAGA GAAGG) ; $_->{count} =()= $sequence =~ m{ $_->{regex} }xmsg for values %patterns; print qq{$_: $patterns{$_}{count}} for sort keys %patterns; " AAAAA: 11 GAAGG: 1 GGAGA: 1 GGGGG: 3` [download]	[reply] [d/l] [select]
Re^4: Regex KungFu help needed by johngg (Canon) on Oct 03, 2009 at 11:03 UTC
Nice, ++ If you don't need to refer to the pattern again you can reduce that to a single step with the uncompiled pattern as key and count as value. `$ perl -Mstrict -wle ' > my $seq = q{GGGGGGGAGAAAAAAAAAAAAAAAGAAGGA}; > my %pats = map { > $_, scalar( () = $seq =~ m{(?=\Q$_\E)}g ); > } qw{ AAAAA GGGGG GGAGA GAAGG }; > print qq{$_: $pats{ $_ }} for sort keys %pats;' AAAAA: 11 GAAGG: 1 GGAGA: 1 GGGGG: 3 $` [download] I expect some Monks could golf that down to seven bytes and a nybble :-) Cheers, JohnGG Update: Extra parentheses inside the map were un-necessary, removed!	[reply] [d/l]
Re^5: Regex KungFu help needed by grizzley (Chaplain) on Oct 05, 2009 at 07:17 UTC
As you wish :) `print "$_: ", $t = () = GGGGGGGAGAAAAAAAAAAAAAAAGAAGGA =~ /(?=\Q$_\E)/ +g, $/ for AAAAA,GAAGG,GGAGA,GGGGG` [download] Removing whitespaces is left as an exercise for the reader :)	[reply] [d/l]