Python Interviews: Difference between revisions
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= Regex =
Positive lookahead (?=REGEX_1)REGEX_2 (?=regex) t(?=s) matches the second t in streets.
Negative lookahead (?!REGEX_1)REGEX_2 (?!regex) t(?!s) matches the first t in streets.
Positive lookbehind (?<=regex) (?<=s)t matches the first t in streets.
Negative lookbehind (?<!regex) (?<!s)t matches the second t in streets.
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