Regular Expressions 101

Pro

Definition Group(?(DEFINE) (?<curly> \{ \g<content>*? \} ) (?<square> \[ \g<content>*? \] ) (?<nested> \g<curly> | \g<square> ) (?<content> [^{}\[\]]++ | \g<nested> ) )

Group curly(?<curly> \{ \g<content>*? \} )

\{the literal { (123₁₀ / 173₈ / 7B₁₆)

\g<content>*?calls group content as a subroutine, repeated any number of times

\}the literal } (125₁₀ / 175₈ / 7D₁₆)

Group square(?<square> \[ \g<content>*? \] )

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\g<content>*?calls group content as a subroutine, repeated any number of times

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

Group nested(?<nested> \g<curly> | \g<square> )

1st Alternative \g<curly>

\g<curly>calls group curly as a subroutine

2nd Alternative \g<square>

\g<square>calls group square as a subroutine

Group content(?<content> [^{}\[\]]++ | \g<nested> )

1st Alternative [^{}\[\]]++

Negated Character Class[^{}\[\]]++

++matches at least one character outside the set below:

{the literal { (123₁₀ / 173₈ / 7B₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

2nd Alternative \g<nested>

\g<nested>calls group nested as a subroutine

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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25 tokens

Regular Expression

(?(DEFINE)
  (?<curly>  \{ \g<content>*? \} )
  (?<square> \[ \g<content>*? \] )

  (?<nested> \g<curly> | \g<square> )

  (?<content> [^{}\[\]]++ | \g<nested> )
)

\g<nested>

Unit Tests

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