Regular Expressions 101

Group 1($(?>[^()]|(?1))*$)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Atomic Group(?>[^()]|(?1))*

*repeats the group contents below any number of times:

1st Alternative[^()]

Negated Character Class[^()]

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

2nd Alternative(?1)

(?1)calls group 1 as a subroutine

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

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.

Search reference

Regular Expression

(\((?>[^()]|(?1))*\))

New

( 10 + 9 ) * ( 13 *7 ) + ( 6 * ( 9 ) * 7 )