Regular Expressions 101

Pro

^start of line

Positive Lookahead(?=.*\b\d{5}\b)

.*any character (except for line terminators), repeated any number of times

\ban ASCII word boundary

\d{5}a digit, repeated exactly 5 times

\ban ASCII word boundary

Non-Capturing Group(?:\D*|\d{1,4})*

*repeats the group contents below any number of times:

1st Alternative\D*

\D*any character that's not a digit, repeated any number of times

2nd Alternative\d{1,4}

\d{1,4}a digit, repeated between 1 and 4 times

\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match

\d{5}a digit, repeated exactly 5 times

Negative Lookahead(?!\d)

\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

Regular Expression

^(?=.*\b\d{5}\b)(?:\D*|\d{1,4})*\K\d{5}(?!\d)

New

;SUPER U CHARLY SUR MARNE;;;rte de Pavant CHARLY SUR MARNE Picardie 02310;Charly-sur-Marne;;;02310;;;;;;;;;;;;;;
test 123456
123456
1234
12345
test 1234 123456 124567 12345

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa