问题
I'm setting up some goals in Google Analytics and could use a little regex help.
Lets say I have 4 URLs
http://www.anydotcom.com/test/search.cfm?metric=blah&selector=size&value=1
http://www.anydotcom.com/test/search.cfm?metric=blah2&selector=style&value=1
http://www.anydotcom.com/test/search.cfm?metric=blah3&selector=size&value=1
http://www.anydotcom.com/test/details.cfm?metric=blah&selector=size&value=1
I want to create an expression that will identify any URL that contains the string selector=size but does NOT contain details.cfm
I know that to find a string that does NOT contain another string I can use this expression:
(^((?!details.cfm).)*$)
But, I'm not sure how to add in the selector=size portion.
Any help would be greatly appreciated!
回答1:
This should do it:
^(?!.*details\.cfm).*selector=size.*$
^.*selector=size.*$ should be clear enough. The first bit, (?!.*details.cfm) is a negative look-ahead: before matching the string it checks the string does not contain "details.cfm" (with any number of characters before it).
回答2:
regex could be (perl syntax):
`/^[(^(?!.*details\.cfm).*selector=size.*)|(selector=size.*^(?!.*details\.cfm).*)]$/`
回答3:
^(?=.*selector=size)(?:(?!details\.cfm).)+$
If your regex engine supported posessive quantifiers (though I suspect Google Analytics does not), then I guess this will perform better for large input sets:
^[^?]*+(?<!details\.cfm).*?selector=size.*$
回答4:
I was looking for a way to avoid --line-buffered on a tail in a similar situation as the OP and Kobi's solution works great for me. In my case excluding lines with either "bot" or "spider" while including ' / ' (for my root document).
My original command:
tail -f mylogfile | grep --line-buffered -v 'bot\|spider' | grep ' / '
Now becomes (with "-P" perl switch):
tail -f mylogfile | grep -P '^(?!.*(bot|spider)).*\s\/\s.*$'
来源：https://stackoverflow.com/questions/2953039/regular-expression-for-a-string-containing-one-word-but-not-another