Regular Expressions 101

Pro

^start of line

Positive Lookahead(?=[01]{8}$)

Character Class[01]{8}

{8}matches exactly 8 characters from the set below:

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

$end of line

Negative Lookahead(?!(?:0*1){6,})

Non-Capturing Group(?:0*1){6,}

{6,}repeats the group contents below at least 6 times:

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

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[01]+

+matches at least one character 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]{8}$)(?!(?:0*1){6,})[01]+$

New

01101101
01111100
10110011
01010101
00011111
11111000
00000000
101010100
101010100000000000000000000000000000000

00111111
11111111
011111