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NathanielWroblewski/readme.md

Created November 3, 2014 20:32
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Positive and Negative Regex Lookahead and Lookbehind
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readme.md

Positive Lookahead

Match any "q" followed by a "u"

string.match(/q(?=u)/)

Negative Lookahead

Match any "q" not followed by a "u"

string.match(/q(?!u)/)

Positive Lookbehind

Match any "q" preceded by a "u"

string.match(/(?<=u)q/)

Negative Lookbehind

Match any "q" not preceded by a "u"

string.match(/(?<!u)q/)
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