Regular Expressions 101

1st Alternative(longword1)(longword2)

Group 1(longword1)

longword1the literal text longword1 (case sensitive)

Group 2(longword2)

longword2the literal text longword2 (case sensitive)

2nd Alternative.*\K(?1).*(?2)

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

\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match

(?1)calls group 1 as a subroutine

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

(?2)calls group 2 as a subroutine

3rd Alternative.*\K(?2).*(?1)

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

\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match

(?2)calls group 2 as a subroutine

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

(?1)calls group 1 as a subroutine

Global pattern flags

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

Regular Expression

(longword1)(longword2)|.*\K(?1).*(?2)|.*\K(?2).*(?1)

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