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

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