Regular Expressions 101

Pro

Non-Capturing Group(?:(?<=\()\d+,\h*|,?\h*\d+\b)

1st Alternative(?<=\()\d+,\h*

Positive Lookbehind(?<=\()

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\d+a digit, repeated at least once

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\h*any horizontal whitespace character, repeated any number of times

2nd Alternative,?\h*\d+\b

,?optionally matches the literal , (44₁₀ / 54₈ / 2C₁₆)

\h*any horizontal whitespace character, repeated any number of times

\d+a digit, repeated at least once

\ban ASCII word boundary

Positive Lookahead(?=[^()]*\))

Negated Character Class[^()]*

*matches any number of characters outside the set below:

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

\)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.

25 tokens

(?:(?<=\()\d+,\h*|,?\h*\d+\b)(?=[^()]*\))

New

Foo 12 (bar, 13)
Foo 12 (13, bar, 14, bar)
Foo (14, 13, 34)
Foo 12 (bar, 13)
Foo 12 (13, bar, 14)
Foo (14, 13)

Foo 12 (bar, 13)
Foo 12 (13, bar, 14, bar)
Foo (14, 13, 34)
Foo 12 (bar, 13)
Foo 12 (13, bar, 14)
Foo (14, 13)