Regular Expressions 101

^start of line

Negative Lookahead(?!(\d)\1{10,})

Group 1(\d)

\da digit

\1{10,}the text saved by group 1, repeated at least 10 times

Positive Lookahead(?=.*\d)

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

\da digit

Character Class[A-Za-z0-9]{11}

{11}matches exactly 11 characters from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

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.

26 tokens

Regular Expression

^(?!(\d)\1{10,})(?=.*\d)[A-Za-z0-9]{11}

New

90956780083
PR213328112
00000000000
00000000001
0000
123456789
1234
abc123
456456
987654321
3210
çá058
PR 213328112
PR.213328112