Regular Expressions 101

Pro

^start of line

Group 1([01]{2})

Character Class[01]{2}

{2}matches exactly 2 characters from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Positive Lookahead(?=(?:[01]*1){2}[01]{4,6}$)

Non-Capturing Group(?:[01]*1){2}

{2}repeats the group contents below exactly 2 times:

Character Class[01]*

*matches any number of characters from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[01]{4,6}

{4,6}matches between 4 and 6 characters from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

$end of line

Group 2([01]{4})

Character Class[01]{4}

{4}matches exactly 4 characters from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Group 3([01]{2})

Character Class[01]{2}

{2}matches exactly 2 characters from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Group 4([01]{2})

Character Class[01]{2}

{2}matches exactly 2 characters from the set below:

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

^([01]{2})(?=(?:[01]*1){2}[01]{4,6}$)([01]{4})([01]{2})([01]{2})$

New

0000110000
0011000000
0001100000
0000110000
0011010000
0011110000
0001110000
0001100000
00011000000
0000000011

0000110000
0011000000
0001100000
0000110000
0011010000
0011110000
0001110000
0001100000
00011000000
0000000011