Regular Expressions 101

Pro

Character Class[\(\[]

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Group 1( \w+| (?R))+

+repeats the group contents below at least once:

1st Alternative \w+

the literal (32₁₀ / 40₈ / 20₁₆)

\w+any word character, repeated at least once

2nd Alternative (?R)

the literal (32₁₀ / 40₈ / 20₁₆)

(?R)recurses into the entire pattern

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

Character Class[\)|\]]

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

|the literal | (124₁₀ / 174₈ / 7C₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

[\(\[]( \w+| (?R))+ ?[\)|\]]

New

( A B )
[ C D ]
[ ( A B ) [ C A ] ]
( Alfa [ Charlie Delta ( Bravo [ Echo ( Foxtrot Golf ) ] ) ] )
( Alef [ ( Bet Bet Bet ) ( Vet [ ( Vet Vet ) ( Vet [ Bet Bet ] ) ] ) ] )
[ ( [ Star ( Star Star ) ] [ Star ( Star Star ) ] Star ) ( [ Star ( Star Star ) ] [ Star ( Star Star ) ] Star ) ]