Regular Expressions 101

Group 1(^|0)

1st Alternative^

^start of line

2nd Alternative0

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Group 2(00|11)*

*repeats the group contents below any number of times:

1st Alternative00

00the literal text 00

2nd Alternative11

11the literal text 11

$end of line

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

Regular Expression

(^|0)1(00|11)*$

New

00001111101
 -> 1
0000100
 -> 1
011001000
 -> 0
1001100
 -> 1
0111100
 -> 0