CHEAT_REGEX.md

Regex Cheatsheet

Regex

PCRE	Name	What it does
(?=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
\bfoo\b	Word Boundaries	Add \b before and/or after the pattern

Regex (Vim)

Vim	Alt.	Name
(foo)@=	\zefoo	Lookahead
(foo)@<=	foo\zs	Lookbehind
(foo)@!		Negative Lookahead
(foo)@<!		Negative Lookbehind
<>		Word Boundaries

Tests for Lookaround and word boundaries

quick

thequickbrown

TheQuickBrown

thequickblack

aquickblack

quickquick

Quick

black

the quick brown fox