regex101: Email input validation

^start of string

Positive Lookahead(?=^[\w.@!#$%&'*+/=?^`{|}~-]{7,254}$)

^start of string

Character Class[\w.@!#$%&'*+/=?^`{|}~-]{7,254}

{7,254}matches between 7 and 254 characters from the set below:

\wany word character

.the literal . (46₁₀ / 56₈ / 2E₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

!the literal ! (33₁₀ / 41₈ / 21₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

^the literal ^ (94₁₀ / 136₈ / 5E₁₆)

`the literal ` (96₁₀ / 140₈ / 60₁₆)

{the literal { (123₁₀ / 173₈ / 7B₁₆)

|the literal | (124₁₀ / 174₈ / 7C₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

~the literal ~ (126₁₀ / 176₈ / 7E₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

$end of string

Group username(?<username>(?=^[\w.!#$%&'*+/=?^`{|}~-]{1,64}@)[\w!#$%&'*+/=?^`{|}~-]+(?:\.[\w!#$%&'*+/=?^`{|}~-]+)*)

Positive Lookahead(?=^[\w.!#$%&'*+/=?^`{|}~-]{1,64}@)

^start of string

Character Class[\w.!#$%&'*+/=?^`{|}~-]{1,64}

{1,64}matches between 1 and 64 characters from the set below:

\wany word character

.the literal . (46₁₀ / 56₈ / 2E₁₆)

!the literal ! (33₁₀ / 41₈ / 21₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

^the literal ^ (94₁₀ / 136₈ / 5E₁₆)

`the literal ` (96₁₀ / 140₈ / 60₁₆)

{the literal { (123₁₀ / 173₈ / 7B₁₆)

|the literal | (124₁₀ / 174₈ / 7C₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

~the literal ~ (126₁₀ / 176₈ / 7E₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

Character Class[\w!#$%&'*+/=?^`{|}~-]+

+matches at least one character from the set below:

\wany word character

!the literal ! (33₁₀ / 41₈ / 21₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

^the literal ^ (94₁₀ / 136₈ / 5E₁₆)

`the literal ` (96₁₀ / 140₈ / 60₁₆)

{the literal { (123₁₀ / 173₈ / 7B₁₆)

|the literal | (124₁₀ / 174₈ / 7C₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

~the literal ~ (126₁₀ / 176₈ / 7E₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:\.[\w!#$%&'*+/=?^`{|}~-]+)*

*repeats the group contents below any number of times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Character Class[\w!#$%&'*+/=?^`{|}~-]+

+matches at least one character from the set below:

\wany word character

!the literal ! (33₁₀ / 41₈ / 21₁₆)

#the literal # (35₁₀ / 43₈ / 23₁₆)

$the literal $ (36₁₀ / 44₈ / 24₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

*the literal * (42₁₀ / 52₈ / 2A₁₆)

+the literal + (43₁₀ / 53₈ / 2B₁₆)

/the literal / (47₁₀ / 57₈ / 2F₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

?the literal ? (63₁₀ / 77₈ / 3F₁₆)

^the literal ^ (94₁₀ / 136₈ / 5E₁₆)

`the literal ` (96₁₀ / 140₈ / 60₁₆)

{the literal { (123₁₀ / 173₈ / 7B₁₆)

|the literal | (124₁₀ / 174₈ / 7C₁₆)

}the literal } (125₁₀ / 175₈ / 7D₁₆)

~the literal ~ (126₁₀ / 176₈ / 7E₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

Group domain(?<domain>(?=\b[a-z\d.-]{5,252}$)(?:[a-z\d](?:[a-z\d-]{0,61}[a-z\d])\.)+(?:(?:[a-z](?:[a-z-]{0,61}[a-z]))|(?:(?=[a-z\d-]*?[a-z])(?=[a-z\d-]*?[\d])[a-z\d](?:[a-z\d-]{0,61}[a-z\d]))))

Positive Lookahead(?=\b[a-z\d.-]{5,252}$)

\ban ASCII word boundary

Character Class[a-z\d.-]{5,252}

{5,252}matches between 5 and 252 characters from the set below:

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

\da digit

.the literal . (46₁₀ / 56₈ / 2E₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

$end of string

Non-Capturing Group(?:[a-z\d](?:[a-z\d-]{0,61}[a-z\d])\.)+

+repeats the group contents below at least once:

Character Class[a-z\d]

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

\da digit

Non-Capturing Group(?:[a-z\d-]{0,61}[a-z\d])

Character Class[a-z\d-]{0,61}

{0,61}matches between 0 and 61 characters from the set below:

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

\da digit

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[a-z\d]

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

\da digit

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:(?:[a-z](?:[a-z-]{0,61}[a-z]))|(?:(?=[a-z\d-]*?[a-z])(?=[a-z\d-]*?[\d])[a-z\d](?:[a-z\d-]{0,61}[a-z\d])))

1st Alternative(?:[a-z](?:[a-z-]{0,61}[a-z]))

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

Character Class[a-z]

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

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

Character Class[a-z-]{0,61}

{0,61}matches between 0 and 61 characters from the set below:

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Character Class[a-z]

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

2nd Alternative(?:(?=[a-z\d-]*?[a-z])(?=[a-z\d-]*?[\d])[a-z\d](?:[a-z\d-]{0,61}[a-z\d]))

Non-Capturing Group(?:(?=[a-z\d-]*?[a-z])(?=[a-z\d-]*?[\d])[a-z\d](?:[a-z\d-]{0,61}[a-z\d]))

Positive Lookahead(?=[a-z\d-]*?[a-z])

Positive Lookahead(?=[a-z\d-]*?[\d])

Character Class[a-z\d]

Non-Capturing Group(?:[a-z\d-]{0,61}[a-z\d])

$end of string

Global pattern flags

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

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

26 tokens

Regular Expression

^(?=^[\w.@!#$%&'*+/=?^`{|}~-]{7,254}$)(?<username>(?=^[\w.!#$%&'*+/=?^`{|}~-]{1,64}@)[\w!#$%&'*+/=?^`{|}~-]+(?:\.[\w!#$%&'*+/=?^`{|}~-]+)*)@(?<domain>(?=\b[a-z\d.-]{5,252}$)(?:[a-z\d](?:[a-z\d-]{0,61}[a-z\d])\.)+(?:(?:[a-z](?:[a-z-]{0,61}[a-z]))|(?:(?=[a-z\d-]*?[a-z])(?=[a-z\d-]*?[\d])[a-z\d](?:[a-z\d-]{0,61}[a-z\d]))))$

New

Add the multiline (/m) Regex option for testing or go to te Unit Tests section...

Valid addresses:

test@email.com
Test2@email.com
another.test@email.com
testwith+flag@email.com
withanyofthese#!%$'&+*-/=?^_.{|}~symbols@email.com
upto64charactersusername56789c123456789d123456789e123456789f1234@email.com
test@with.any.number.of.labels.separated.by.dots.email.com
test@even.with.digits.1234567890.email.com
test@and-hypens-email.com
t@upto252charactersdomainname89c123456789d123456789e123456789f123.butonlyupto63charactersperlabel6789j123456789k123456789l1234567.9m123456789n123456789o123456789p123456789q123456789r123456789s1.3456789t123456789u123456789v123456789w123456789x12.email.com

Invalid adresses:

.usernamestartingwithdot@email.com
usernameendingwithdot.@email.com
havingtwo..consecutivedotsintheusername@email.com
test@orinthedomainname..email.com
test@having.all.numerical.top-level-domain.888
havinglessthan2characterperlabel@1.a.email.com
(havingothersymbolsnotlisted)@email.com
usingotherthanletters.digits.and-hyphens{anddots}inthedomainname@[123.45.67.89]

Substitution

Add the multiline (/m) Regex option for testing or go to te Unit Tests section...

Valid addresses:

test@email.com
Test2@email.com
another.test@email.com
testwith+flag@email.com
withanyofthese#!%$'&+*-/=?^_.{|}~symbols@email.com
upto64charactersusername56789c123456789d123456789e123456789f1234@email.com
test@with.any.number.of.labels.separated.by.dots.email.com
test@even.with.digits.1234567890.email.com
test@and-hypens-email.com
t@upto252charactersdomainname89c123456789d123456789e123456789f123.butonlyupto63charactersperlabel6789j123456789k123456789l1234567.9m123456789n123456789o123456789p123456789q123456789r123456789s1.3456789t123456789u123456789v123456789w123456789x12.email.com

Invalid adresses:

.usernamestartingwithdot@email.com
usernameendingwithdot.@email.com
havingtwo..consecutivedotsintheusername@email.com
test@orinthedomainname..email.com
test@having.all.numerical.top-level-domain.888
havinglessthan2characterperlabel@1.a.email.com
(havingothersymbolsnotlisted)@email.com
usingotherthanletters.digits.and-hyphens{anddots}inthedomainname@[123.45.67.89]