Re: Regular expression for a comma separated string

"Without repetition" sounds difficult. Why does it have to be a single monstrous regular expression? Is it just for fun?

Comment on Re: Regular expression for a comma separated string

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Re^2: Regular expression for a comma separated string by naderra (Novice) on Nov 24, 2014 at 00:10 UTC
It doesn't have to be. I didn't mention earlier, I did try to break it down but with no success. `/^(?=[ACGT]{1,4},[ACGT]{1,4}$).$/ && /^(?!.(.).\1.,).$/ && /^(?!,.(.).\1).$/` [download]	[reply] [d/l]
Re^3: Regular expression for a comma separated string by Anonymous Monk on Nov 24, 2014 at 00:43 UTC
Well then, I'd do it like that `my @lst = qw( A,G AG,CT TC,CA GAT,CGA CGAT,TG ,G ACGT X,A AA,G AC,GGC ATGA,TGG ATCXG,AAC ATA,TG GTA,YC); for (@lst) { my $good = do { m/^ [ATCG]+ , [ATCG]+ $/x and not grep m/(.) .* \1/x, split ','; }; print $_, $good ? ' good' : ' bad', "\n"; }` [download] Output: `A,G good AG,CT good TC,CA good GAT,CGA good CGAT,TG good ,G bad ACGT bad X,A bad AA,G bad AC,GGC bad ATGA,TGG bad ATCXG,AAC bad ATA,TG bad GTA,YC bad` [download]	[reply] [d/l] [select]