Regular Expressions 101

Group 1((.+).*)

Group 2(.+)

.+any character (except for line terminators), repeated at least once

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

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Negative Lookahead(?!.*(?=\1)(((?=(..+)(\5+$))\6)*)(?!\2))

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

Positive Lookahead(?=\1)

\1the text saved by group 1

Group 3(((?=(..+)(\5+$))\6)*)

Group 4((?=(..+)(\5+$))\6)*

*repeats the group contents below any number of times:

Positive Lookahead(?=(..+)(\5+$))

Group 5(..+)

.any character (except for line terminators)

.+any character (except for line terminators), repeated at least once

Group 6(\5+$)

\5+the text saved by group 5, repeated at least once

$end of line

\6the text saved by group 6

Negative Lookahead(?!\2)

\2the text saved by group 2

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

Positive Lookahead(?=\1)

\1the text saved by group 1

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

(?3)calls group 3 as a subroutine

\2the text saved by group 2

$end of line

Global pattern flags

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

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

((.+).*),(?!.*(?=\1)(((?=(..+)(\5+$))\6)*)(?!\2)).*(?=\1)\K(?3)\2$

111,11111
11111,11111111111
111111111,11111111111
111111111,1111111111111111111