regex101: JavaScript Match Workspace

Explanation

Pro

^start of line

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)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group 1([\w.-]?[a-zA-Z0-9])*

*repeats the group contents below any number of times:

Character Class[\w.-]?

?matches at most one character from the set below:

\wany word character

.the literal . (46₁₀ / 56₈ / 2E₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

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)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

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)

Non-Capturing Group(?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?

?repeats the group contents below at most once:

Character Class[a-zA-Z0-9-]{0,61}

{0,61}matches between 0 and 61 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 - (45₁₀ / 55₈ / 2D₁₆)

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)

Non-Capturing Group(?:\.([a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?){2,})+

+repeats the group contents below at least once:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2([a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?){2,}

{2,}repeats the group contents below at least 2 times:

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)

Non-Capturing Group(?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?

?repeats the group contents below at most once:

Character Class[a-zA-Z0-9-]{0,61}

{0,61}matches between 0 and 61 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 - (45₁₀ / 55₈ / 2D₁₆)

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)

$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

Quick Reference

26 tokens

Regular Expression

^[a-zA-Z_-]([\w.-]?[a-zA-Z0-9])*@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.([a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?){2,})+$

New

something@something.com
something@something.name
something@something.name.com
something@some-thing.startups
someone@localhost.localdomain
someone@somewhere.com.
someone@do-ma-in.com
simple@example.com
very.common@example.com
other.email-with-dash@example.com
fully-qualified-domain@example.com
x@example.com
example-indeed@strange-example.com
example@s.solutions
a@a.aa

somebody@example
somebody.example
.wooly@example.com
wo..oly@example.com
 a@p.com
a@a.a
a@p.com
a.@p.com
test()@somebody.example
test..x@somebody.example
test..@somebody.example
someone@127.0.0.1
invalid:email@example.com
@somewhere.com
example.com
@@example.com
a space@example.com
something@ex..ample.com
a@c
""testlah""@example.com
someone@somewhere.com@
someone@somewhere.com@somewhere.com
someone@somewhere_com
someone@some:where.com
.
F/s/f/a@feo+re.com
some+long+email+address@some+host-weird-/looking.com
a @p.com
ddjk-s-jk@asl-.com
someone@do-.com
somebody@-p.com
somebody@-.com
Abc.example.com
A@b@c@example.com
a"b(c)d