itomg/email-regex.txt

## email-regex.txt
## Ref http://emailregex.com/

#### General Email Regex (RFC 5322 Official Standard)
```
(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])
```

#### Python
```python
r"(^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$)"
```

#### Javascript
```js
/^[-a-z0-9~!$%^&*_=+}{\'?]+(\.[-a-z0-9~!$%^&*_=+}{\'?]+)*@([a-z0-9_][-a-z0-9_]*(\.[-a-z0-9_]+)*\.(aero|arpa|biz|com|coop|edu|gov|info|int|mil|museum|name|net|org|pro|travel|mobi|[a-z][a-z])|([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}))(:[0-9]{1,5})?$/i
```

#### Swift (Regex only)
```swift
[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,6}

## Swift (Regex used in a function)
func validateEmail(candidate: String) -> Bool {
 let emailRegex = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,6}"
 return NSPredicate(format: "SELF MATCHES %@", emailRegex).evaluateWithObject(candidate)
}
```

#### PHP
```php
/^(?!(?:(?:\x22?\x5C[\x00-\x7E]\x22?)|(?:\x22?[^\x5C\x22]\x22?)){255,})(?!(?:(?:\x22?\x5C[\x00-\x7E]\x22?)|(?:\x22?[^\x5C\x22]\x22?)){65,}@)(?:(?:[\x21\x23-\x27\x2A\x2B\x2D\x2F-\x39\x3D\x3F\x5E-\x7E]+)|(?:\x22(?:[\x01-\x08\x0B\x0C\x0E-\x1F\x21\x23-\x5B\x5D-\x7F]|(?:\x5C[\x00-\x7F]))*\x22))(?:\.(?:(?:[\x21\x23-\x27\x2A\x2B\x2D\x2F-\x39\x3D\x3F\x5E-\x7E]+)|(?:\x22(?:[\x01-\x08\x0B\x0C\x0E-\x1F\x21\x23-\x5B\x5D-\x7F]|(?:\x5C[\x00-\x7F]))*\x22)))*@(?:(?:(?!.*[^.]{64,})(?:(?:(?:xn--)?[a-z0-9]+(?:-[a-z0-9]+)*\.){1,126}){1,}(?:(?:[a-z][a-z0-9]*)|(?:(?:xn--)[a-z0-9]+))(?:-[a-z0-9]+)*)|(?:\[(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){7})|(?:(?!(?:.*[a-f0-9][:\]]){7,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?)))|(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){5}:)|(?:(?!(?:.*[a-f0-9]:){5,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3}:)?)))?(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))(?:\.(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))){3}))\]))$/iD
```

#### Perl / Ruby
```ruby
(?:(?:\r\n)?[ \t])*(?:(?:(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t]
 )+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:
 \r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(
 ?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[
 \t]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\0
 31]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\
 ](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+
 (?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:
 (?:\r\n)?[ \t])*))*|(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z
 |(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)
 ?[ \t])*)*\<(?:(?:\r\n)?[ \t])*(?:@(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\
 r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[
 \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)
 ?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t]
 )*))*(?:,@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[
 \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*
 )(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t]
 )+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*)
 *:(?:(?:\r\n)?[ \t])*)?(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+
 |\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r
 \n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:
 \r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t
 ]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031
 ]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](
 ?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?
 :(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?
 :\r\n)?[ \t])*))*\>(?:(?:\r\n)?[ \t])*)|(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?
 :(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?
 [ \t]))*"(?:(?:\r\n)?[ \t])*)*:(?:(?:\r\n)?[ \t])*(?:(?:(?:[^()<>@,;:\\".\[\]
 \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|
 \\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>
 @,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"
 (?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t]
 )*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\
 ".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?
 :[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[
 \]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*|(?:[^()<>@,;:\\".\[\] \000-
 \031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(
 ?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)*\<(?:(?:\r\n)?[ \t])*(?:@(?:[^()<>@,;
 :\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([
 ^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\"
 .\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\
 ]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*(?:,@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\
 [\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\
 r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\]
 \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]
 |\\.)*\](?:(?:\r\n)?[ \t])*))*)*:(?:(?:\r\n)?[ \t])*)?(?:[^()<>@,;:\\".\[\] \0
 00-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\
 .|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,
 ;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|"(?
 :[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*))*@(?:(?:\r\n)?[ \t])*
 (?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".
 \[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t])*(?:[
 ^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\]
 ]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*\>(?:(?:\r\n)?[ \t])*)(?:,\s*(
 ?:(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\
 ".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)(?:\.(?:(
 ?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[
 \["()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t
 ])*))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t
 ])+|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?
 :\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|
 \Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*|(?:
 [^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".\[\
 ]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)*\<(?:(?:\r\n)
 ?[ \t])*(?:@(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["
 ()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)
 ?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>
 @,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*(?:,@(?:(?:\r\n)?[
 \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,
 ;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\.(?:(?:\r\n)?[ \t]
 )*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\
 ".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*)*:(?:(?:\r\n)?[ \t])*)?
 (?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\["()<>@,;:\\".
 \[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])*)(?:\.(?:(?:
 \r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z|(?=[\[
 "()<>@,;:\\".\[\]]))|"(?:[^\"\r\\]|\\.|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])
 *))*@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])
 +|\Z|(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*)(?:\
 .(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+|\Z
 |(?=[\["()<>@,;:\\".\[\]]))|\[([^\[\]\r\\]|\\.)*\](?:(?:\r\n)?[ \t])*))*\>(?:(
 ?:\r\n)?[ \t])*))*)?;\s*)
```

#### Perl 5.10 or newer
```perl
/(?(DEFINE)
(?<address> (?&mailbox) | (?&group))
(?<mailbox> (?&name_addr) | (?&addr_spec))
(?<name_addr> (?&display_name)? (?&angle_addr))
(?<angle_addr> (?&CFWS)? < (?&addr_spec) > (?&CFWS)?)
(?<group> (?&display_name) : (?:(?&mailbox_list) | (?&CFWS))? ;
(?&CFWS)?)
(?<display_name> (?&phrase))
(?<mailbox_list> (?&mailbox) (?: , (?&mailbox))*)

(?<addr_spec> (?&local_part) \@ (?&domain))
(?<local_part> (?&dot_atom) | (?&quoted_string))
(?<domain> (?&dot_atom) | (?&domain_literal))
(?<domain_literal> (?&CFWS)? \[ (?: (?&FWS)? (?&dcontent))* (?&FWS)?
\] (?&CFWS)?)
(?<dcontent> (?&dtext) | (?&quoted_pair))
(?<dtext> (?&NO_WS_CTL) | [\x21-\x5a\x5e-\x7e])

(?<atext> (?&ALPHA) | (?&DIGIT) | [!#\$%&'*+-/=?^_`{|}~])
(?<atom> (?&CFWS)? (?&atext)+ (?&CFWS)?)
(?<dot_atom> (?&CFWS)? (?&dot_atom_text) (?&CFWS)?)
(?<dot_atom_text> (?&atext)+ (?: \. (?&atext)+)*)

(?<text> [\x01-\x09\x0b\x0c\x0e-\x7f])
(?<quoted_pair> \\ (?&text))

(?<qtext> (?&NO_WS_CTL) | [\x21\x23-\x5b\x5d-\x7e])
(?<qcontent> (?&qtext) | (?&quoted_pair))
(?<quoted_string> (?&CFWS)? (?&DQUOTE) (?:(?&FWS)? (?&qcontent))*
(?&FWS)? (?&DQUOTE) (?&CFWS)?)

(?<word> (?&atom) | (?&quoted_string))
(?<phrase> (?&word)+)

# Folding white space
(?<FWS> (?: (?&WSP)* (?&CRLF))? (?&WSP)+)
(?<ctext> (?&NO_WS_CTL) | [\x21-\x27\x2a-\x5b\x5d-\x7e])
(?<ccontent> (?&ctext) | (?&quoted_pair) | (?&comment))
(?<comment> \( (?: (?&FWS)? (?&ccontent))* (?&FWS)? \) )
(?<CFWS> (?: (?&FWS)? (?&comment))*
(?: (?:(?&FWS)? (?&comment)) | (?&FWS)))

# No whitespace control
(?<NO_WS_CTL> [\x01-\x08\x0b\x0c\x0e-\x1f\x7f])

(?<ALPHA> [A-Za-z])
(?<DIGIT> [0-9])
(?<CRLF> \x0d \x0a)
(?<DQUOTE> ")
(?<WSP> [\x20\x09])
)

(?&address)/x
```

#### Ruby (simpler version)
```ruby
/\A([\w+\-].?)+@[a-z\d\-]+(\.[a-z]+)*\.[a-z]+\z/i
```

#### .NET
```net
^\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$
```

#### Find All Email Addresses in a File using Grep
```bash
$ grep -E -o "\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,6}\b" filename.txt
```

#### SQL Server Email Validation
```sql
 select email
 from table_name where
 patindex ('%[ &'',":;!+=\/()<>]%', email) > 0 -- Invalid characters
 or patindex ('[@.-_]%', email) > 0 -- Valid but cannot be starting character
 or patindex ('%[@.-_]', email) > 0 -- Valid but cannot be ending character
 or email not like '%@%.%' -- Must contain at least one @ and one .
 or email like '%..%' -- Cannot have two periods in a row
 or email like '%@%@%' -- Cannot have two @ anywhere
 or email like '%.@%' or email like '%@.%' -- Cannot have @ and . next to each other
 or email like '%.cm' or email like '%.co' -- Camaroon or Colombia? Typos.
 or email like '%.or' or email like '%.ne' -- Missing last letter
```

#### Oracle PL/SQL Email Regex
```sql
SELECT email
FROM table_name
WHERE REGEXP_LIKE (email, '[A-Z0-9._%-]+@[A-Z0-9._%-]+\.[A-Z]{2,4}');
```

#### MySQL
```sql
SELECT * FROM `users` WHERE `email` NOT REGEXP '^[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$';
```
	## Ref http://emailregex.com/

	#### General Email Regex (RFC 5322 Official Standard)
	```
	(?:[a-z0-9!#$%&'+/=?^_`{\|}~-]+(?:\.[a-z0-9!#$%&'+/=?^_`{\|}~-]+)\|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]\|\\[\x01-\x09\x0b\x0c\x0e-\x7f])")@(?:(?:[a-z0-9](?:[a-z0-9-][a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-][a-z0-9])?\|\[(?:(?:25[0-5]\|2[0-4][0-9]\|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]\|2[0-4][0-9]\|[01]?[0-9][0-9]?\|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]\|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])
	```

	#### Python
	```python
	r"(^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$)"
	```

	#### Javascript
	```js
	/^[-a-z0-9~!$%^&_=+}{\'?]+(\.[-a-z0-9~!$%^&_=+}{\'?]+)@([a-z0-9_][-a-z0-9_](\.[-a-z0-9_]+)*\.(aero\|arpa\|biz\|com\|coop\|edu\|gov\|info\|int\|mil\|museum\|name\|net\|org\|pro\|travel\|mobi\|[a-z][a-z])\|([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}))(:[0-9]{1,5})?$/i
	```

	#### Swift (Regex only)
	```swift
	[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,6}

	## Swift (Regex used in a function)
	func validateEmail(candidate: String) -> Bool {
	let emailRegex = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,6}"
	return NSPredicate(format: "SELF MATCHES %@", emailRegex).evaluateWithObject(candidate)
	}
	```

	#### PHP
	```php
	/^(?!(?:(?:\x22?\x5C[\x00-\x7E]\x22?)\|(?:\x22?[^\x5C\x22]\x22?)){255,})(?!(?:(?:\x22?\x5C[\x00-\x7E]\x22?)\|(?:\x22?[^\x5C\x22]\x22?)){65,}@)(?:(?:[\x21\x23-\x27\x2A\x2B\x2D\x2F-\x39\x3D\x3F\x5E-\x7E]+)\|(?:\x22(?:[\x01-\x08\x0B\x0C\x0E-\x1F\x21\x23-\x5B\x5D-\x7F]\|(?:\x5C[\x00-\x7F]))\x22))(?:\.(?:(?:[\x21\x23-\x27\x2A\x2B\x2D\x2F-\x39\x3D\x3F\x5E-\x7E]+)\|(?:\x22(?:[\x01-\x08\x0B\x0C\x0E-\x1F\x21\x23-\x5B\x5D-\x7F]\|(?:\x5C[\x00-\x7F]))\x22)))@(?:(?:(?!.[^.]{64,})(?:(?:(?:xn--)?[a-z0-9]+(?:-[a-z0-9]+)\.){1,126}){1,}(?:(?:[a-z][a-z0-9])\|(?:(?:xn--)[a-z0-9]+))(?:-[a-z0-9]+))\|(?:\[(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){7})\|(?:(?!(?:.[a-f0-9][:\]]){7,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?)))\|(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){5}:)\|(?:(?!(?:.*[a-f0-9]:){5,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3}:)?)))?(?:(?:25[0-5])\|(?:2[0-4][0-9])\|(?:1[0-9]{2})\|(?:[1-9]?[0-9]))(?:\.(?:(?:25[0-5])\|(?:2[0-4][0-9])\|(?:1[0-9]{2})\|(?:[1-9]?[0-9]))){3}))\]))$/iD
	```

	#### Perl / Ruby
	```ruby
	(?:(?:\r\n)?[ \t])*(?:(?:(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t]
	)+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|"(?:[^\"\r\\]\|\\.\|(?:(?:\r\n)?[ \t]))*"(?:(?:
	\r\n)?[ \t]))(?:\.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(
	?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|"(?:[^\"\r\\]\|\\.\|(?:(?:\r\n)?[
	\t]))"(?:(?:\r\n)?[ \t])))@(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\\".\[\] \000-\0
	31]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|\[([^\[\]\r\\]\|\\.)*\
	](?:(?:\r\n)?[ \t]))(?:\.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\\".\[\] \000-\031]+
	(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|\[([^\[\]\r\\]\|\\.)*\](?:
	(?:\r\n)?[ \t])))\|(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z
	\|(?=[\["()<>@,;:\\".\[\]]))\|"(?:[^\"\r\\]\|\\.\|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)
	?[ \t]))\<(?:(?:\r\n)?[ \t])*(?:@(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\
	r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|\[([^\[\]\r\\]\|\\.)*\](?:(?:\r\n)?[
	\t]))(?:\.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)
	?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|\[([^\[\]\r\\]\|\\.)*\](?:(?:\r\n)?[ \t]
	)))(?:,@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[
	\t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|\[([^\[\]\r\\]\|\\.)\](?:(?:\r\n)?[ \t])
	)(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t]
	)+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|\[([^\[\]\r\\]\|\\.)\](?:(?:\r\n)?[ \t])))*)
	:(?:(?:\r\n)?[ \t]))?(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+
	\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|"(?:[^\"\r\\]\|\\.\|(?:(?:\r\n)?[ \t]))*"(?:(?:\r
	\n)?[ \t]))(?:\.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:
	\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|"(?:[^\"\r\\]\|\\.\|(?:(?:\r\n)?[ \t
	]))"(?:(?:\r\n)?[ \t])))@(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\\".\[\] \000-\031
	]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|\[([^\[\]\r\\]\|\\.)*\](
	?:(?:\r\n)?[ \t]))(?:\.(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\\".\[\] \000-\031]+(?
	:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|\[([^\[\]\r\\]\|\\.)*\](?:(?
	:\r\n)?[ \t])))\>(?:(?:\r\n)?[ \t])*)\|(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?
	:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|"(?:[^\"\r\\]\|\\.\|(?:(?:\r\n)?
	[ \t]))"(?:(?:\r\n)?[ \t])):(?:(?:\r\n)?[ \t])(?:(?:(?:[^()<>@,;:\\".\[\]
	\000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|"(?:[^\"\r\\]\|
	\\.\|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t]))(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>
	@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|"
	(?:[^\"\r\\]\|\\.\|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t])))*@(?:(?:\r\n)?[ \t]
	)*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\
	".\[\]]))\|\[([^\[\]\r\\]\|\\.)\](?:(?:\r\n)?[ \t]))(?:\.(?:(?:\r\n)?[ \t])*(?
	:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[
	\]]))\|\[([^\[\]\r\\]\|\\.)\](?:(?:\r\n)?[ \t])))*\|(?:[^()<>@,;:\\".\[\] \000-
	\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|"(?:[^\"\r\\]\|\\.\|(
	?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t]))\<(?:(?:\r\n)?[ \t])(?:@(?:[^()<>@,;
	:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|\[([
	^\[\]\r\\]\|\\.)\](?:(?:\r\n)?[ \t]))(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\"
	.\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|\[([^\[\
	]\r\\]\|\\.)\](?:(?:\r\n)?[ \t])))(?:,@(?:(?:\r\n)?[ \t])(?:[^()<>@,;:\\".\
	[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|\[([^\[\]\
	r\\]\|\\.)\](?:(?:\r\n)?[ \t]))(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\]
	\000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|\[([^\[\]\r\\]
	\|\\.)\](?:(?:\r\n)?[ \t])))):(?:(?:\r\n)?[ \t])*)?(?:[^()<>@,;:\\".\[\] \0
	00-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|"(?:[^\"\r\\]\|\\
	.\|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t]))(?:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,
	;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|"(?
	:[^\"\r\\]\|\\.\|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t])))@(?:(?:\r\n)?[ \t])
	(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".
	\[\]]))\|\[([^\[\]\r\\]\|\\.)\](?:(?:\r\n)?[ \t]))(?:\.(?:(?:\r\n)?[ \t])*(?:[
	^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\]
	]))\|\[([^\[\]\r\\]\|\\.)\](?:(?:\r\n)?[ \t])))\>(?:(?:\r\n)?[ \t]))(?:,\s*(
	?:(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\
	".\[\]]))\|"(?:[^\"\r\\]\|\\.\|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t]))(?:\.(?:(
	?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[
	\["()<>@,;:\\".\[\]]))\|"(?:[^\"\r\\]\|\\.\|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t
	])))@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t
	])+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|\[([^\[\]\r\\]\|\\.)\](?:(?:\r\n)?[ \t]))(?
	:\.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|
	\Z\|(?=[\["()<>@,;:\\".\[\]]))\|\[([^\[\]\r\\]\|\\.)\](?:(?:\r\n)?[ \t])))*\|(?:
	[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".\[\
	]]))\|"(?:[^\"\r\\]\|\\.\|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t]))*\<(?:(?:\r\n)
	?[ \t])*(?:@(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["
	()<>@,;:\\".\[\]]))\|\[([^\[\]\r\\]\|\\.)\](?:(?:\r\n)?[ \t]))(?:\.(?:(?:\r\n)
	?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>
	@,;:\\".\[\]]))\|\[([^\[\]\r\\]\|\\.)\](?:(?:\r\n)?[ \t])))*(?:,@(?:(?:\r\n)?[
	\t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,
	;:\\".\[\]]))\|\[([^\[\]\r\\]\|\\.)\](?:(?:\r\n)?[ \t]))(?:\.(?:(?:\r\n)?[ \t]
	)*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\
	".\[\]]))\|\[([^\[\]\r\\]\|\\.)\](?:(?:\r\n)?[ \t])))):(?:(?:\r\n)?[ \t])*)?
	(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\["()<>@,;:\\".
	\[\]]))\|"(?:[^\"\r\\]\|\\.\|(?:(?:\r\n)?[ \t]))"(?:(?:\r\n)?[ \t]))(?:\.(?:(?:
	\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z\|(?=[\[
	"()<>@,;:\\".\[\]]))\|"(?:[^\"\r\\]\|\\.\|(?:(?:\r\n)?[ \t]))*"(?:(?:\r\n)?[ \t])
	))@(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])
	+\|\Z\|(?=[\["()<>@,;:\\".\[\]]))\|\[([^\[\]\r\\]\|\\.)\](?:(?:\r\n)?[ \t]))(?:\
	.(?:(?:\r\n)?[ \t])*(?:[^()<>@,;:\\".\[\] \000-\031]+(?:(?:(?:\r\n)?[ \t])+\|\Z
	\|(?=[\["()<>@,;:\\".\[\]]))\|\[([^\[\]\r\\]\|\\.)\](?:(?:\r\n)?[ \t])))*\>(?:(
	?:\r\n)?[ \t]))))?;\s*)
	```

	#### Perl 5.10 or newer
	```perl
	/(?(DEFINE)
	(?<address> (?&mailbox) \| (?&group))
	(?<mailbox> (?&name_addr) \| (?&addr_spec))
	(?<name_addr> (?&display_name)? (?&angle_addr))
	(?<angle_addr> (?&CFWS)? < (?&addr_spec) > (?&CFWS)?)
	(?<group> (?&display_name) : (?:(?&mailbox_list) \| (?&CFWS))? ;
	(?&CFWS)?)
	(?<display_name> (?&phrase))
	(?<mailbox_list> (?&mailbox) (?: , (?&mailbox))*)

	(?<addr_spec> (?&local_part) \@ (?&domain))
	(?<local_part> (?&dot_atom) \| (?&quoted_string))
	(?<domain> (?&dot_atom) \| (?&domain_literal))
	(?<domain_literal> (?&CFWS)? \[ (?: (?&FWS)? (?&dcontent))* (?&FWS)?
	\] (?&CFWS)?)
	(?<dcontent> (?&dtext) \| (?&quoted_pair))
	(?<dtext> (?&NO_WS_CTL) \| [\x21-\x5a\x5e-\x7e])

	(?<atext> (?&ALPHA) \| (?&DIGIT) \| [!#\$%&'*+-/=?^_`{\|}~])
	(?<atom> (?&CFWS)? (?&atext)+ (?&CFWS)?)
	(?<dot_atom> (?&CFWS)? (?&dot_atom_text) (?&CFWS)?)
	(?<dot_atom_text> (?&atext)+ (?: \. (?&atext)+)*)

	(?<text> [\x01-\x09\x0b\x0c\x0e-\x7f])
	(?<quoted_pair> \\ (?&text))

	(?<qtext> (?&NO_WS_CTL) \| [\x21\x23-\x5b\x5d-\x7e])
	(?<qcontent> (?&qtext) \| (?&quoted_pair))
	(?<quoted_string> (?&CFWS)? (?&DQUOTE) (?:(?&FWS)? (?&qcontent))*
	(?&FWS)? (?&DQUOTE) (?&CFWS)?)

	(?<word> (?&atom) \| (?&quoted_string))
	(?<phrase> (?&word)+)

	# Folding white space
	(?<FWS> (?: (?&WSP)* (?&CRLF))? (?&WSP)+)
	(?<ctext> (?&NO_WS_CTL) \| [\x21-\x27\x2a-\x5b\x5d-\x7e])
	(?<ccontent> (?&ctext) \| (?&quoted_pair) \| (?&comment))
	(?<comment> \( (?: (?&FWS)? (?&ccontent))* (?&FWS)? \) )
	(?<CFWS> (?: (?&FWS)? (?&comment))*
	(?: (?:(?&FWS)? (?&comment)) \| (?&FWS)))

	# No whitespace control
	(?<NO_WS_CTL> [\x01-\x08\x0b\x0c\x0e-\x1f\x7f])

	(?<ALPHA> [A-Za-z])
	(?<DIGIT> [0-9])
	(?<CRLF> \x0d \x0a)
	(?<DQUOTE> ")
	(?<WSP> [\x20\x09])
	)

	(?&address)/x
	```

	#### Ruby (simpler version)
	```ruby
	/\A([\w+\-].?)+@[a-z\d\-]+(\.[a-z]+)*\.[a-z]+\z/i
	```

	#### .NET
	```net
	^\w+([-+.']\w+)@\w+([-.]\w+)\.\w+([-.]\w+)*$
	```

	#### Find All Email Addresses in a File using Grep
	```bash
	$ grep -E -o "\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,6}\b" filename.txt
	```

	#### SQL Server Email Validation
	```sql
	select email
	from table_name where
	patindex ('%[ &'',":;!+=\/()<>]%', email) > 0 -- Invalid characters
	or patindex ('[@.-_]%', email) > 0 -- Valid but cannot be starting character
	or patindex ('%[@.-_]', email) > 0 -- Valid but cannot be ending character
	or email not like '%@%.%' -- Must contain at least one @ and one .
	or email like '%..%' -- Cannot have two periods in a row
	or email like '%@%@%' -- Cannot have two @ anywhere
	or email like '%.@%' or email like '%@.%' -- Cannot have @ and . next to each other
	or email like '%.cm' or email like '%.co' -- Camaroon or Colombia? Typos.
	or email like '%.or' or email like '%.ne' -- Missing last letter
	```

	#### Oracle PL/SQL Email Regex
	```sql
	SELECT email
	FROM table_name
	WHERE REGEXP_LIKE (email, '[A-Z0-9._%-]+@[A-Z0-9._%-]+\.[A-Z]{2,4}');
	```

	#### MySQL
	```sql
	SELECT * FROM `users` WHERE `email` NOT REGEXP '^[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$';
	```