Regular Expressions 101

Pro

Non-Capturing Group(?:(\G|^)|)

1st Alternative(\G|^)

Group 1(\G|^)

1st Alternative\G

\Gstart of current search

2nd Alternative^

^start of line

2nd Alternative — matches an empty string

Condition(?(1)(?:a+|\d+([^a\d]+))|\d+)

Uses the first branch if group 1 matched

If the condition is true, match this branch:(?:a+|\d+([^a\d]+))

Non-Capturing Group(?:a+|\d+([^a\d]+))

1st Alternativea+

a+the literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive), repeated at least once

2nd Alternative\d+([^a\d]+)

\d+a digit, repeated at least once

Group 2([^a\d]+)

Negated Character Class[^a\d]+

+matches at least one character outside the set below:

athe literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive)

\da digit

Otherwise, match this branch:\d+

\d+a digit, repeated at least once

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

(?:(\G|^)|)(?(1)(?:a+|\d+([^a\d]+))|\d+)

New

123,456,789
123,456,a,789
123,aaa,456,aa,789
aaa,aa,aaa
aa,123,456,aaaa,789
aaa,123,456,aa,789,aaaa

123,456,789
123,456,a,789
123,aaa,456,aa,789
aaa,aa,aaa
aa,123,456,aaaa,789
aaa,123,456,aa,789,aaaa