Python Lookbehind

Python Lookbehind explained.

Positive Lookbehind

(?<=regex) Matches at a position if the pattern inside the lookbehind can be matched ending at that position.


Consider the following string:


Positive lookbehind assertion can help us to find all words 'scientific', 'scientific' and 'end' preeceded by the words learner{1-3}.

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