Regular Expressions 101

^start of line

Group 1([a-zA-Z][\w+-]+(?:\.\w+)?)

Character Class[a-zA-Z]

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

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

Character Class[\w+-]+

+matches at least one character from the set below:

\wany word character

+the literal + (43₁₀ / 53₈ / 2B₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:\.\w+)?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\w+any word character, repeated at least once

@the literal @ (64₁₀ / 100₈ / 40₁₆)

Group 2([\w-]+(?:\.[a-z]{2,10})+)

Character Class[\w-]+

+matches at least one character from the set below:

\wany word character

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:\.[a-z]{2,10})+

+repeats the group contents below at least once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-z]{2,10}

{2,10}matches between 2 and 10 characters from the set below:

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

$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

^([a-zA-Z][\w+-]+(?:\.\w+)?)@([\w-]+(?:\.[a-z]{2,10})+)$

New

a@co.kk.pp
aa.@co.kk.pp
aa..@co.kk.pp
a.a@co.kk.pp

aa@co.kk.pp
aaa@co.kk.pp
aa.s@co.kk.pp
aa.ss@co.kk.pp

a@co.kk.pp
aa.@co.kk.pp
aa..@co.kk.pp
a.a@co.kk.pp

aa@co.kk.pp
aaa@co.kk.pp
aa.s@co.kk.pp
aa.ss@co.kk.pp