Regular Expressions 101

Pro

^start of line

Group 1([-+] ?)?

?repeats the group contents below at most once:

Character Class[-+]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

?optionally matches the literal (32₁₀ / 40₈ / 20₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

Group 2(,[0-9]+)?

?repeats the group contents below at most once:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Character Class[0-9]+

+matches at least one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

$end of line

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

^([-+] ?)?[0-9]+(,[0-9]+)?$

New

123,456,789
-12,34
1234
-8
1,2,345

123,456,789
-12,34
1234
-8
1,2,345