Regular Expressions 101

Pro

^start of line

Group 1(0|(1(01*0)*1))*

*repeats the group contents below any number of times:

1st Alternative0

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

2nd Alternative(1(01*0)*1)

Group 2(1(01*0)*1)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Group 3(01*0)*

*repeats the group contents below any number of times:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1*the literal 1 (49₁₀ / 61₈ / 31₁₆) , repeated any number of times

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

$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(01*0)*1))*$

Substitution