Regular Expressions 101

Pro

Negative Lookbehind(?<![\d,.])

Character Class[\d,.]

\da digit

,the literal , (44₁₀ / 54₈ / 2C₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

1st Alternative\d{1,3}(?:(?=([.,]))(?:\1\d{3})*)?

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

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

?repeats the group contents below at most once:

Positive Lookahead(?=([.,]))

Group 1([.,])

Character Class[.,]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

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

*repeats the group contents below any number of times:

\1the text saved by group 1

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

2nd Alternative\d+

\d+a digit, repeated at least once

Non-Capturing Group(?:(?!\1)[.,]\d{1,2})?

?repeats the group contents below at most once:

Negative Lookahead(?!\1)

\1the text saved by group 1

Character Class[.,]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\d{1,2}a digit, repeated between 1 and 2 times

Negative Lookahead(?![,.\d])

Character Class[,.\d]

,the literal , (44₁₀ / 54₈ / 2C₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\da digit

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

(?<![\d,.])(?:\d{1,3}(?:(?=([.,]))(?:\1\d{3})*)?|\d+)(?:(?!\1)[.,]\d{1,2})?(?![,.\d])

New

0,1
1.234,01
1234,10
1234,10a
123,456,789.10
123.456.789,10
50
50000
50,000,000
50000,7
50000.7
1234,1

,1
1,
1234,100
123,456.789,10