Regular Expressions 101

Explanation

Pro

Positive Lookahead(?=(?:(?:\\x1b\[[0-9;]+m)?.){80})

Non-Capturing Group(?:(?:\\x1b\[[0-9;]+m)?.){80}

{80}repeats the group contents below exactly 80 times:

Non-Capturing Group(?:\\x1b\[[0-9;]+m)?

?repeats the group contents below at most once:

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

x1bthe literal text x1b (case sensitive)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Character Class[0-9;]+

+matches at least one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

mthe literal m (109₁₀ / 155₈ / 6D₁₆) (case sensitive)

.any Unicode character (except for line terminators)

Non-Capturing Group(?:(?:\\x1b\[[0-9;]+m)?.){0,80}

{0,80}repeats the group contents below between 0 and 80 times:

Non-Capturing Group(?:\\x1b\[[0-9;]+m)?

?repeats the group contents below at most once:

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

x1bthe literal text x1b (case sensitive)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Character Class[0-9;]+

+matches at least one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

mthe literal m (109₁₀ / 155₈ / 6D₁₆) (case sensitive)

.any Unicode character (except for line terminators)

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

the literal (32₁₀ / 40₈ / 20₁₆)

Global pattern flags

u modifier: unicode. Treats the pattern and subject as UTF-16

g modifier: global. Finds all matches instead of stopping after the first

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(?=(?:(?:\\x1b\[[0-9;]+m)?.){80})(?:(?:\\x1b\[[0-9;]+m)?.){0,80}\K

New

Morbi leo risus, \x1b[34;1mporta ac consectetur\x1b[39;22m ac, vestibulum at eros. Aenean lacinia bibendum nulla sed consectetur. Nullam id dolor id nibh ultricies vehicula ut id elit. Aenean lacinia bibendum nulla sed consectetur. Curabitur blandit tempus porttitor.

Substitution

\n

Morbi leo risus, \x1b[34;1mporta ac consectetur\x1b[39;22m ac, vestibulum at eros. Aenean lacinia bibendum nulla sed consectetur. Nullam id dolor id nibh ultricies vehicula ut id elit. Aenean lacinia bibendum nulla sed consectetur. Curabitur blandit tempus porttitor.