Regular Expressions 101

Pro

^start of line

-?optionally matches the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:(?:0|[1-9][0-9]*)(?:,[0-9]+)?|[1-9][0-9]{1,2}(?:,[0-9]{3})+)

1st Alternative(?:0|[1-9][0-9]*)(?:,[0-9]+)?

Non-Capturing Group(?:0|[1-9][0-9]*)

1st Alternative0

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

2nd Alternative[1-9][0-9]*

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

Character Class[0-9]*

*matches any number of characters from the set below:

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

Non-Capturing Group(?:,[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)

2nd Alternative[1-9][0-9]{1,2}(?:,[0-9]{3})+

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

Character Class[0-9]{1,2}

{1,2}matches between 1 and 2 characters from the set below:

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

Non-Capturing Group(?:,[0-9]{3})+

+repeats the group contents below at least once:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Character Class[0-9]{3}

{3}matches exactly 3 characters 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|[1-9][0-9]*)(?:,[0-9]+)?|[1-9][0-9]{1,2}(?:,[0-9]{3})+)$

New

123,456,789
-12,34
1234
-8
0,12
1,2,345
0

123,456,789
-12,34
1234
-8
0,12
1,2,345
0