how can i much the sentense, if it doesn't contain none of {word1,word2,word3} where i must put ^ symbol? i think it must looks like this
^([^word1|word2|word3])$
but it doesn't work. could you help? thanks
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A:
Regex isn't the best tool for testing these sorts of conditions, but if you must then you can do it with negative lookaheads:
^(?!.*word1)(?!.*word2)(?!.*word3).*$
What you are trying to do won't work because [^...] is a negative character class with an unordered list of characters. What you wrote is equivalent to:
^([^123dorw|])$
Note also that depending on your needs you might also want to include word-boundaries in your regular expression:
^(?!.*\bword1\b)(?!.*\bword2\b)(?!.*\bword3\b).*$
Mark Byers
2010-04-24 13:42:02
@Mark Byers but i need to use ir in .htaccess. will it work by ^(?!.*word1)(?!.*word2)(?!.*word3).*$?
Syom
2010-04-24 13:48:22
Mark Byers
2010-04-24 13:54:37
@Mark Byers thanks much Mark. but it's new for me! i neve do such things by so.could you explain why ? and . and * in (?!.*word1), and where you "say" 'none of those words'?
Syom
2010-04-24 14:00:09
@Syom If this is just for .htaccess, the question should not be tagged PHP. There are tags for htaccess and mod_rewrite, those might be more apt.
Heikki Naski
2010-04-24 15:20:36
A:
im not familiar with the use of regex in htaccess, so my thoughts may be bit high level:
what you try looks like kind of: if sentence contains not word1 | not word2 | not word3 then do something
i would suggest a solution the way: if sentence contains word1|word2|word3 then do nothing else do something
means don't use the negation in the "query", but in the result, which makes the regex simpler.
Philipp Andre
2010-04-24 15:33:02