Regular Expressions 101

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

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

*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(?R)

(?R)recurses into the entire pattern

\)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

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

New

( 1000 - ( 22 / ( 7 + 4  ) * 8  ) *  9  )