regex101: JavaScript Match Workspace

^start of line

Group 1([a-zA-Z]+([\.-_]?[a-zA-z0-9]+)*)

Character Class[a-zA-Z]+

+matches at least one character 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)

Group 2([\.-_]?[a-zA-z0-9]+)*

*repeats the group contents below any number of times:

Character Class[\.-_]?

?matches at most one character from the set below:

\.-_one character from . (46₁₀) to _ (95₁₀)

Character Class[a-zA-z0-9]+

+matches at least one character from the set below:

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

A-zone character from A (65₁₀) to z (122₁₀) (case sensitive)

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

\@the literal @ (64₁₀ / 100₈ / 40₁₆)

Group 3([a-zA-Z0-9]+)

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

+matches at least one character 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)

Group 4([-][0-9a-z]+)?

?repeats the group contents below at most once:

Character Class[-]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[0-9a-z]+

+matches at least one character from the set below:

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

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 5([a-z-]{2,20})

Character Class[a-z-]{2,20}

{2,20}matches between 2 and 20 characters from the set below:

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 6(\.[a-z]{2,3})?

?repeats the group contents below at most once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[a-z]{2,3}

{2,3}matches between 2 and 3 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

Search reference

Regular Expression

^([a-zA-Z]+([\.-_]?[a-zA-z0-9]+)*)\@([a-zA-Z0-9]+)([-][0-9a-z]+)?\.([a-z-]{2,20})(\.[a-z]{2,3})?$

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Regular Expressions 101

Regular Expression

Substitution