Regular Expressions 101

^start of line

Negative Lookahead(?!.*[!-\/:-@[-`{-~]{2})

.*any character (except for line terminators), repeated any number of times

Character Class[!-\/:-@[-`{-~]{2}

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

!-\/one character from ! (33₁₀) to / (47₁₀)

:-@one character from : (58₁₀) to @ (64₁₀)

[-`one character from [ (91₁₀) to ` (96₁₀)

{-~one character from { (123₁₀) to ~ (126₁₀)

Character Class[A-Za-z0-9 ]*

*matches any number of characters from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

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

the literal (32₁₀ / 40₈ / 20₁₆)

Non-Capturing Group(?:[!-\/:-@[-`{-~][A-Za-z0-9 ]*){0,4}

{0,4}repeats the group contents below between 0 and 4 times:

Character Class[!-\/:-@[-`{-~]

!-\/one character from ! (33₁₀) to / (47₁₀)

:-@one character from : (58₁₀) to @ (64₁₀)

[-`one character from [ (91₁₀) to ` (96₁₀)

{-~one character from { (123₁₀) to ~ (126₁₀)

Character Class[A-Za-z0-9 ]*

*matches any number of characters from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

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

the literal (32₁₀ / 40₈ / 20₁₆)

$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.

26 tokens

Regular Expression

^(?!.*[!-\/:-@[-`{-~]{2})[A-Za-z0-9 ]*(?:[!-\/:-@[-`{-~][A-Za-z0-9 ]*){0,4}$

New

I'm #1! I feel greaaaat!
I''m kinda .{}. sad
a.a,aaa
a.a,a[]a/

I'm #1! I feel greaaaat!
I''m kinda .{}. sad
a.a,aaa
a.a,a[]a/