Positive look-behind assertion (?<=...)
Q
What is a positive look-behind assertion? How to use it?
How to write a regular expression to find words ending with 'oo' in text like: ?
✍: FYIcenter.com
A
A positive look-behind assertion is a zero-width assertion that allows you to match a subpattern left to the current position (look-behind) without moving the matching position. Positive look-behind assertion is expressed as (?<=pattern). For example:
(?<=\t)\w+ - matches a word that follows a tab
The regular expression to match find words ending with 'oo' is: Note that:
* - skip space characters (\w+) - capture the word (?<=oo) - is the word ending with '00'?
2013-01-31, 2798👍, 0💬