regex101: PCRE (Legacy) Match Workspace

Definition Group(?(DEFINE) (?<recurs> (?! {@|@} ) [^|] [^{@|\\]* ( \\.[^{@|\\]* )* | (?R) ) )

Group recurs(?<recurs> (?! {@|@} ) [^|] [^{@|\\]* ( \\.[^{@|\\]* )* | (?R) )

1st Alternative (?! {@|@} ) [^|] [^{@|\\]* ( \\.[^{@|\\]* )*

Negative Lookahead(?! {@|@} )

1st Alternative {@

{@the literal text {@

2nd Alternative@}

@} the literal text @}

Negated Character Class[^|]

|the literal | (124₁₀ / 174₈ / 7C₁₆)

Negated Character Class[^{@|\\]*

*matches any number of characters outside the set below:

{the literal { (123₁₀ / 173₈ / 7B₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

|the literal | (124₁₀ / 174₈ / 7C₁₆)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

Group 2( \\.[^{@|\\]* )*

*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 { (123₁₀ / 173₈ / 7B₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

|the literal | (124₁₀ / 174₈ / 7C₁₆)

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

2nd Alternative (?R)

(?R)recurses into the entire pattern

{@ the literal text {@

Group If(?<If>\w+)

\w+any word character, repeated at least once

- the literal text -

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

Group 5(%?\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 6(:\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> [|] [^{@|]*+ (?&recurs)* )

Character Class[|]

|the literal | (124₁₀ / 174₈ / 7C₁₆)

Negated Character Class[^{@|]*+

*+matches any number of characters outside the set below:

{the literal { (123₁₀ / 173₈ / 7B₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

|the literal | (124₁₀ / 174₈ / 7C₁₆)

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

Group False(?<False> [|] (?&recurs)* )?

?repeats the group contents below at most once:

Character Class[|]

|the literal | (124₁₀ / 174₈ / 7C₁₆)

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

\s*any whitespace character, 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

Search reference

Regular Expression

(?(DEFINE)
  (?<recurs>
    (?! {@|@} ) [^|] [^{@|\\]* ( \\.[^{@|\\]* )* | (?R)
  )
)
{@
(?<If>\w+)-
(?<Condition>(%?\w++ (:\w+)*)* )
(?<True> [|] [^{@|]*+ (?&recurs)* )
(?<False> [|] (?&recurs)* )?
\s*@}

Unit Tests

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