Regular Expressions 101

Pro

^start of line

0*the literal 0 (48₁₀ / 60₈ / 30₁₆) , repeated any number of times

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

Non-Capturing Group(?:[01]*?((?(1)\1)1))+

+repeats the group contents below at least once:

Character Class[01]*?

*?matches any number of characters from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

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

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

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

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

^0*\K(?:[01]*?((?(1)\1)1))+

New

01
1001111
010011111
0100111110001110
0100111011001110
0100111110011110
0100111111111111110001110
0100111011001110
1011010111
0100111011001110

01
1001111
010011111
0100111110001110
0100111011001110
0100111110011110
0100111111111111110001110
0100111011001110
1011010111
0100111011001110