Create Regular Expression for Email Validation

Regular Expression Pattern

Eg:- /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/

Please find each character attribute information of above expression below.

Character	Description
/ .. /	All regular expressions start and end with forward slashes.
^	Matches the beginning of the string or line.
\w+	Matches one or more word characters including the underscore. Equivalent to [A-Za-z0-9_].
[\.-]	\ Indicates that the next character is special and not to be interpreted literally. .- matches character . or -.
?	Matches the previous character 0 or 1 time. Here previous character is [.-].
\w+	Matches 1 or more word characters including the underscore. Equivalent to [A-Za-z0-9_].
*	Matches the previous character 0 or more times.
([.-]?\w+)*	Matches 0 or more occurrences of [.-]?\w+.
\w+([.-]?\w+)*	The sub-expression \w+([.-]?\w+)* is used to match the username in the email. It begins with at least one or more word characters including the underscore, equivalent to [A-Za-z0-9_]. , followed by . or - and . or - must follow by a word character (A-Za-z0-9_).
@	It matches only @ character.
\w+([.-]?\w+)*	It matches the domain name with the same pattern of user name described above..
\.\w{2,3}	It matches a . followed by two or three word characters, e.g., .edu, .org, .com, .uk, .us, .co etc.
+	The + sign specifies that the above sub-expression shall occur one or more times, e.g., .com, .co.us, .edu.uk etc.
$	Matches the end of the string or line.

Note: If you want to work on 4 digit domain, for example, .info or .edxu  or .tiff  then you must change w{2,3} to w{2,4}.