Regular Expressions 101

^start of line

Non-Capturing Group(?:\d+|\d{1,3}([ _.,])\d{3}(?:\1\d{3})*)

1st Alternative\d+

\d+a Unicode decimal digit, repeated at least once

2nd Alternative\d{1,3}([ _.,])\d{3}(?:\1\d{3})*

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

Group 1([ _.,])

Character Class[ _.,]

the literal (32₁₀ / 40₈ / 20₁₆)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

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

Non-Capturing Group(?:\1\d{3})*

*repeats the group contents below any number of times:

\1the text saved by group 1

\d{3}a Unicode decimal 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+|\d{1,3}([ _.,])\d{3}(?:\1\d{3})*)$

New

1
12
123
123.456.789.884
12.55
12.345
2,234,647
2,234_754
2 234 723
123456
1
12
123
1234
12345
123456
1234567
123.456789
12.123.
1234567890,