Regular Expressions 101

Group 1((^, @|@\s+)|@*[a-zA-Z0-9]* +[a-zA-Z0-9])

1st Alternative(^, @|@\s+)

Group 2(^, @|@\s+)

1st Alternative^, @

^start of string

, @the literal text , @

2nd Alternative@\s+

@the literal @ (64₁₀ / 100₈ / 40₁₆)

\s+any whitespace character, repeated at least once

2nd Alternative@*[a-zA-Z0-9]* +[a-zA-Z0-9]

@*the literal @ (64₁₀ / 100₈ / 40₁₆) , repeated any number of times

Character Class[a-zA-Z0-9]*

*matches any number of characters from the set below:

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

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

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

+the literal (32₁₀ / 40₈ / 20₁₆) , repeated at least once

Character Class[a-zA-Z0-9]

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

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

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

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

((^, @|@\s+)|@*[a-zA-Z0-9]* +[a-zA-Z0-9])

@tag1,@tag2
@tag1, @tag2
@tag1

@tag 1
@tag    1, @t a g2
@t ag       1, @tag 2
@tag1,          @    tag sdf-sdf
@tag 1,    @ tag2 

tag  acb