Regular expression

Regular expression is a powerful technique for non-beginners to validate, replace or split text values. Use tools like RegExpress to test and learn regular expression syntax.

Validate a simple e-mail address.
Syntax: ^[a-z.]+@[a-z]+(\.+[a-z]+)+

^	Matches the start of the string
[a-z.]+	Allow one or more lower case char a to z and dot
@	Must contain one e-mail At character
[a-z]+	Allow one or more lower case char a to z
(	Begin sub expression
\.	Must contain one dot
[a-z]	Allow one or more lower case char a to z
)	End sub expression
+	One or more sub expression

Split one or more email addresses separated by comma or semicolon.
Syntax: [,;]+

[,;]	Find separator comma or semicolon
+	One or more separator