Regular Expressions 101

^start of line

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

Group 1(,\d{3})*

*repeats the group contents below any number of times:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\d{3}a digit, repeated exactly 3 times

$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.

Search reference

Regular Expression

^\d{1,3}(,\d{3})*$

New

42
1,234
6,368,745
6,368,745,123
12,34,567
123233
999999999,999