CODE EXAMPLE FOR PYTHON

positive lookahead regex python

(?=foo)	Lookahead	Asserts that what immediately follows the current position in the string is foo
(?<=foo)	Lookbehind	Asserts that what immediately precedes the current position in the string is foo
(?!foo)	Negative Lookahead	Asserts that what immediately follows the current position in the string is not foo
(?<!foo)	Negative Lookbehind	Asserts that what immediately precedes the current position in the string is not foo