Lookahead and Lookbehind Tutorial—Tips &Tricks

(direct link) Jumping Points For easy navigation, here are some jumping points to various sections of the page: ✽ Lookahead Example: Simple Password Validation ✽ The Order of Lookaheads Doesn't Matter… Almost ✽ Lookarounds Stand their Ground ✽ Various Uses for Lookarounds ✽ Zero-Width Matches ✽ Positioning the Lookaround Before or After the Characters to be Matched ✽ Lookarounds that Look on Both

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