Regular Expressions 101

Pro

1st Alternative^(?>.*?(foo|bar|baz)){2}.*(*SKIP)(*F)

^start of line

Atomic Group(?>.*?(foo|bar|baz)){2}

{2}repeats the group contents below exactly 2 times:

.*?any character (except for line terminators), repeated any number of times

Group 1(foo|bar|baz)

1st Alternativefoo

foothe literal text foo (case insensitive)

2nd Alternativebar

barthe literal text bar (case insensitive)

3rd Alternativebaz

bazthe literal text baz (case insensitive)

.*any character (except for line terminators), repeated any number of times

(*SKIP)acts like (*PRUNE), but the next unanchored match attempt starts where (*SKIP) was reached instead of at the next subject character

(*F)forces the current match attempt to fail at this position

2nd Alternative(?1)

(?1)calls group 1 as a subroutine

Global pattern flags

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

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25 tokens

^(?>.*?(foo|bar|baz)){2}.*(*SKIP)(*F)|(?1)

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