Regular Expressions 101

Non-Capturing Group(?:^(?!({{(?1)*?}}|(?:(?!{{|}}).)*)*+$)(*COMMIT)(*F))?

?repeats the group contents below at most once:

^start of line

Negative Lookahead(?!({{(?1)*?}}|(?:(?!{{|}}).)*)*+$)

Group 1({{(?1)*?}}|(?:(?!{{|}}).)*)*+

*+repeats the group contents below any number of times:

1st Alternative{{(?1)*?}}

{{the literal text {{

(?1)*?calls group 1 as a subroutine, repeated any number of times

}}the literal text }}

2nd Alternative(?:(?!{{|}}).)*

Non-Capturing Group(?:(?!{{|}}).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!{{|}})

1st Alternative{{

{{the literal text {{

2nd Alternative}}

}}the literal text }}

.any character (except for line terminators)

$end of line

(*COMMIT)if the rest of the pattern fails, ends the entire match operation without trying another starting position

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

Group 2({{|}}|(?:(?!{{|}})[^ ])+(?!({{(?3)*?}}|(?:(?!{{|}}).)*)*+$))

1st Alternative{{

{{the literal text {{

2nd Alternative}}

}}the literal text }}

3rd Alternative(?:(?!{{|}})[^ ])+(?!({{(?3)*?}}|(?:(?!{{|}}).)*)*+$)

Non-Capturing Group(?:(?!{{|}})[^ ])+

+repeats the group contents below at least once:

Negative Lookahead(?!{{|}})

1st Alternative{{

{{the literal text {{

2nd Alternative}}

}}the literal text }}

Negated Character Class[^ ]

the literal (32₁₀ / 40₈ / 20₁₆)

Negative Lookahead(?!({{(?3)*?}}|(?:(?!{{|}}).)*)*+$)

Group 3({{(?3)*?}}|(?:(?!{{|}}).)*)*+

*+repeats the group contents below any number of times:

1st Alternative{{(?3)*?}}

{{the literal text {{

(?3)*?calls group 3 as a subroutine, repeated any number of times

}}the literal text }}

2nd Alternative(?:(?!{{|}}).)*

Non-Capturing Group(?:(?!{{|}}).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!{{|}})

1st Alternative{{

{{the literal text {{

2nd Alternative}}

.any character (except for line terminators)

$end of line

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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Search reference

Regular Expression

(?:^(?!({{(?1)*?}}|(?:(?!{{|}}).)*)*+$)(*COMMIT)(*F))?({{|}}|(?:(?!{{|}})[^ ])+(?!({{(?3)*?}}|(?:(?!{{|}}).)*)*+$))

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