Regular Expressions 101

{@ the literal text {@

Group If(?<If> \w+)

\w+any word character, repeated at least once

- the literal text -

Group Condition(?<Condition> (%?\w++ (:\w+)*)* )

Group 3(%?\w++ (:\w+)*)*

*repeats the group contents below any number of times:

%?optionally matches the literal % (37₁₀ / 45₈ / 25₁₆)

\w++any word character, repeated at least once

Group 4(:\w+)*

*repeats the group contents below any number of times:

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\w+any word character, repeated at least once

Group True(?<True> [|] [^|\\]* (?: \\.[^|\\]* )* )

Character Class[|]

|the literal | (124₁₀ / 174₈ / 7C₁₆)

Negated Character Class[^|\\]*

*matches any number of characters outside the set below:

|the literal | (124₁₀ / 174₈ / 7C₁₆)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

Non-Capturing Group(?: \\.[^|\\]* )*

*repeats the group contents below any number of times:

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

.any character (except for line terminators)

Negated Character Class[^|\\]*

*matches any number of characters outside the set below:

|the literal | (124₁₀ / 174₈ / 7C₁₆)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

Group False(?<False> [|] \X*)?

?repeats the group contents below at most once:

Character Class[|]

|the literal | (124₁₀ / 174₈ / 7C₁₆)

\X*one Unicode extended grapheme cluster, repeated any number of times

@}the literal text @}

Global pattern flags

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

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

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Search reference

Regular Expression

{@
(?<If> \w+)-
(?<Condition> (%?\w++ (:\w+)*)* )
(?<True> [|] [^|\\]* (?: \\.[^|\\]* )* )
(?<False> [|] \X*)?
@}

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