Regular Expressions 101

Explanation

Pro

^start of line

Group 1(([^<>()\[\]\.,;:\s@\"]{1,64}(\.[^<>()\[\]\.,;:\s@\"]+)*)|(\".+\"))

1st Alternative([^<>()\[\]\.,;:\s@\"]{1,64}(\.[^<>()\[\]\.,;:\s@\"]+)*)

Group 2([^<>()\[\]\.,;:\s@\"]{1,64}(\.[^<>()\[\]\.,;:\s@\"]+)*)

Negated Character Class[^<>()\[\]\.,;:\s@\"]{1,64}

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

<the literal < (60₁₀ / 74₈ / 3C₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\sa Unicode whitespace character

@the literal @ (64₁₀ / 100₈ / 40₁₆)

\"the literal " (34₁₀ / 42₈ / 22₁₆)

Group 3(\.[^<>()\[\]\.,;:\s@\"]+)*

*repeats the group contents below any number of times:

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negated Character Class[^<>()\[\]\.,;:\s@\"]+

+matches at least one character outside the set below:

<the literal < (60₁₀ / 74₈ / 3C₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

\sa Unicode whitespace character

@the literal @ (64₁₀ / 100₈ / 40₁₆)

\"the literal " (34₁₀ / 42₈ / 22₁₆)

2nd Alternative(\".+\")

Group 4(\".+\")

\"the literal " (34₁₀ / 42₈ / 22₁₆)

.+any Unicode character (except for line terminators), repeated at least once

\"the literal " (34₁₀ / 42₈ / 22₁₆)

@the literal @ (64₁₀ / 100₈ / 40₁₆)

\[*the literal [ (91₁₀ / 133₈ / 5B₁₆) , repeated any number of times

Negative Lookahead(?!.*?\.\.)

.*?any Unicode character (except for line terminators), repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 5(([^<>()[\]\.,;\s@\"]+\.?)+[^<>()[\]\.,;\s@\"]{2,})

Group 6([^<>()[\]\.,;\s@\"]+\.?)+

+repeats the group contents below at least once:

Negated Character Class[^<>()[\]\.,;\s@\"]+

+matches at least one character outside the set below:

<the literal < (60₁₀ / 74₈ / 3C₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

\sa Unicode whitespace character

@the literal @ (64₁₀ / 100₈ / 40₁₆)

\"the literal " (34₁₀ / 42₈ / 22₁₆)

\.?optionally matches the literal . (46₁₀ / 56₈ / 2E₁₆)

Negated Character Class[^<>()[\]\.,;\s@\"]{2,}

{2,}matches at least 2 characters outside the set below:

<the literal < (60₁₀ / 74₈ / 3C₁₆)

>the literal > (62₁₀ / 76₈ / 3E₁₆)

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

\sa Unicode whitespace character

@the literal @ (64₁₀ / 100₈ / 40₁₆)

\"the literal " (34₁₀ / 42₈ / 22₁₆)

\]?optionally matches the literal ] (93₁₀ / 135₈ / 5D₁₆)

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

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

^(([^<>()\[\]\.,;:\s@\"]{1,64}(\.[^<>()\[\]\.,;:\s@\"]+)*)|(\".+\"))@\[*(?!.*?\.\.)(([^<>()[\]\.,;\s@\"]+\.?)+[^<>()[\]\.,;\s@\"]{2,})\]?

New

prettyandsimple@example.com
very.common@example.com
disposable.style.email.with+symbol@example.com
other.email-with-dash@example.com

(one-letter local part)
x@example.com

"much.more unusual"@example.com
"very.unusual.@.unusual.com"@example.com
"very.(),:;<>[]\".VERY.\"very@\\ \"very\".unusual"@strange.example.com
example-indeed@strange-example.com
 
(local domain name with no TLD)
admin@mailserver1

#!$%&'*+-/=?^_`{}|~@example.org
"()<>[]:,;@\\\"!#$%&'*+-/=?^_`{}| ~.a"@example.org

(space between the quotes)
" "@example.org

example@localhost
example@s.solutions
user@com
user@localserver
user@[2001:DB8::1][
user@[IPv6:2001:db8::1]
©other.email-with-dash@example.com
?prettyandsimple@example.com
用户@例子.广告
अजअय@डाअटा.भारत
квіточка@пошта.укр
θσερ@εχαμπλε.ψομ
Dörte@Sörensen.example.com
аджай@экзампл.рус


Invalid email addresses[edit]

(no @ character)
Abc.example.com

(only one @ is allowed outside quotation marks)
A@b@c@example.com

(none of the special characters in this local part are

Extraction

prettyandsimple@example.com
very.common@example.com
disposable.style.email.with+symbol@example.com
other.email-with-dash@example.com

(one-letter local part)
x@example.com

"much.more unusual"@example.com
"very.unusual.@.unusual.com"@example.com
"very.(),:;<>[]\".VERY.\"very@\\ \"very\".unusual"@strange.example.com
example-indeed@strange-example.com
 
(local domain name with no TLD)
admin@mailserver1

#!$%&'*+-/=?^_`{}|~@example.org
"()<>[]:,;@\\\"!#$%&'*+-/=?^_`{}| ~.a"@example.org

(space between the quotes)
" "@example.org

example@localhost
example@s.solutions
user@com
user@localserver
user@[2001:DB8::1][
user@[IPv6:2001:db8::1]
©other.email-with-dash@example.com
?prettyandsimple@example.com
用户@例子.广告
अजअय@डाअटा.भारत
квіточка@пошта.укр
θσερ@εχαμπλε.ψομ
Dörte@Sörensen.example.com
аджай@экзампл.рус


Invalid email addresses[edit]

(no @ character)
Abc.example.com

(only one @ is allowed outside quotation marks)
A@b@c@example.com

(none of the special characters in this local part are