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A look-ahead is fine, you just have to insert .* (zero or more of anything) before the "b" I think.

$ perl -E ' > say qq{$_ - @{ [ m{a(?!.*b)} ? q{Match} : q{No match} ] }} for ( > q{Have you any fish}, > q{What a nice broom}, > q{Fishing for trout}, > );' Have you any fish - Match What a nice broom - No match Fishing for trout - No match $

I hope this is of interest.

Cheers,

JohnGG


In reply to Re^2: Find all strings containing "a" characters, that are not followed by "b" characters. by johngg
in thread Find all strings containing "a" characters, that are not followed by "b" characters. by Kyshtynbai

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