Regular Expressions 101

Pro

^start of string

Group User(?'User'[_a-z0-9-]+(\.[_a-z0-9-]+)*)

Character Class[_a-z0-9-]+

+matches at least one character from the set below:

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

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

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 2(\.[_a-z0-9-]+)*

*repeats the group contents below any number of times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[_a-z0-9-]+

+matches at least one character from the set below:

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

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

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

Group Domain(?'Domain'[a-z0-9-]+(\.[a-z0-9-]+)*\.[a-z]{2,4})

Character Class[a-z0-9-]+

+matches at least one character from the set below:

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

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 4(\.[a-z0-9-]+)*

*repeats the group contents below any number of times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-z0-9-]+

+matches at least one character from the set below:

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

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-z]{2,4}

{2,4}matches between 2 and 4 characters from the set below:

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

$end of string, or before its final line terminator

Global pattern flags

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Detailed match information will be displayed here automatically.

25 tokens

^(?'User'[_a-z0-9-]+(\.[_a-z0-9-]+)*)@(?'Domain'[a-z0-9-]+(\.[a-z0-9-]+)*\.[a-z]{2,4})$

New

kevi.metal.maty.rock@goo.gle.ma.il.com