Regular Expressions 101

Pro

Group 1(\((\d+|(?1))([+*](\d+|(?1)))+\))

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Group 2(\d+|(?1))

1st Alternative\d+

\d+a digit, repeated at least once

2nd Alternative(?1)

(?1)calls group 1 as a subroutine

Group 3([+*](\d+|(?1)))+

+repeats the group contents below at least once:

Character Class[+*]

+the literal + (43₁₀ / 53₈ / 2B₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

Group 4(\d+|(?1))

1st Alternative\d+

\d+a digit, repeated at least once

2nd Alternative(?1)

(?1)calls group 1 as a subroutine

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

\d+a digit, repeated at least once

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

25 tokens

(\((\d+|(?1))([+*](\d+|(?1)))+\))=\d+

(123+1*1+(1*1)+(1*(123+1)))=1

(123+1*1+(1*1)+(1*(123+1)))=1