Regular Expressions 101

Non-Capturing Group(?:(1(?(1)\1)).*?)+

+repeats the group contents below at least once:

Group 1(1(?(1)\1))

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Condition(?(1)\1)

Uses the first branch if group 1 matched

If the condition is true, match this branch:\1

\1the text saved by group 1

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

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(?(1)\1)).*?)+

New

01
1001111
010011111
0100111110001110
0100111011001110
0100111110011110