I have three string samples below:
day/Mon/done
day/Tue/done
day/Wed/done
How do I extract day/Wed/done using negation for the other two? Below doesn't work.
/day/[^(Mon|Tue)]/done
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adizone
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1if you look towards the right side of this page for "related", you will probably see this question: http://stackoverflow.com/questions/406230/regular-expression-to-match-string-not-containing-a-word?rq=1 – Peter Sep 12 '14 at 21:56
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Not a C question - suggest removing tag. – chux - Reinstate Monica Sep 12 '14 at 22:11
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Thanks @Peter for pointing to the link. – adizone Sep 12 '14 at 23:16
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@chux: The C tag is relevant if it implies that OP intends to usre a posix-compatible regex library. (i.e. no negative lookahead). – rici Sep 12 '14 at 23:34
2 Answers
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It's not how negated character classes work -- they still interpret each character inside the [..] as a single character. And there is no match for
day/?/done
where ? is only one character. Either use any of the techniques in Regular expression to match a line that doesn't contain a word? (thanks, Peter!), or make good use of the fact that the first character for these days are unique:
day/[^MT]../done
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1The OP *wants* to match `Wed` (or, more precisely, neither `Mon` nor `Tue`). – Jongware Sep 12 '14 at 22:46