Regular Expressions 101

Pro

^start of string

Character Class[-+]?

?matches at most one character from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

Group 1(\d{1,3})

\d{1,3}a digit, repeated between 1 and 3 times

Group 2(,?(?1))*

*repeats the group contents below any number of times:

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

(?1)calls group 1 as a subroutine

$end of string, or before its final line terminator

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{1,3})(,?(?1))*$

New

1,2,3,4,5

1,2,3,4,5