Negative look-behind assertion (?<!...)
Q
What is a negative look-behind assertion? How to use it?
How to write a regular expression to find words not ending with 'oo' in text like: ?
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A
A negative look-behind assertion is a zero-width assertion that allows you to not match a subpattern left to the current position (look-behind) without moving the matching position. Negative look-behind assertion is expressed as (?<!pattern). For example:
(?<!\t)\w+ - matches a word that does not follow a tab
The regular expression to match find words ending without 'oo' is: Note that:
* - skip space characters (\w+) - capture the word (?<!oo) - is the word not ending with '00'?
2013-01-31, 2620👍, 0💬