Regular Expressions 101

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Lookahead and lookbehind example

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  • PCRE2 (PHP)
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0

Regular Expression

/
(?<!XXY)(?<=Y)\w(?=Y)(?!YYXX)
/
gm

Description

An example of lookahead and lookbehind, both negative and positive. Allows to limit matches within specified limits without capture groups

Submitted by CAMOKPYT