Regular Expressions 101

Pro

(?m)applies the following effective flags to the remainder of the pattern: gm

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

^start of line

Negative Lookahead(?!0)

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Positive Lookahead(?=\d{10}$)

\d{10}a digit, repeated exactly 10 times

$end of line

Positive Lookahead(?=.*?(.)(?:.*\1){1,2})

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

Group 1(.)

.any character (except for line terminators)

Non-Capturing Group(?:.*\1){1,2}

{1,2}repeats the group contents below between 1 and 2 times:

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

\1the text saved by group 1

Negative Lookahead(?!.*?(.)(?:.*\2){3})

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

Group 2(.)

.any character (except for line terminators)

Non-Capturing Group(?:.*\2){3}

{3}repeats the group contents below exactly 3 times:

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

\2the text saved by group 2

Negative Lookahead(?!.*?(?!\1)(.).*\3)

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

Negative Lookahead(?!\1)

\1the text saved by group 1

Group 3(.)

.any character (except for line terminators)

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

\3the text saved by group 3

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

$end of line

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

27 tokens

Regular Expression

(?m)^(?!0)(?=\d{10}$)(?=.*?(.)(?:.*\1){1,2})(?!.*?(.)(?:.*\2){3})(?!.*?(?!\1)(.).*\3).*$

New

1234567890
1234537890

1134567890
2123456789
1234267890
1671812342
1934466892:6
1234@56789
3563893124
4412356789
2349780915
981651321182234556
1234567890
10000000000
02346ex789
0000%00000
0234567 894
8232527884
02325278847
02345678945
2323456789
8152228374
0234527834
8183746528
0435465768
3245657689