Apache Struts 2 Documentation > Home > Guides > Core Developers Guide > Validation > email validator |
EmailValidator checks that a given String field, if not empty, is a valid email address.
The regular expression used to validate that the string is an email address is:
\\b^['_a-z0-9-\\+](\\.['_a-z0-9-\\+])@[a-z0-9-](\\.[a-z0-9-])\\.([a-z]{2}|aero|arpa|asia|biz|com|coop|edu|gov|info|int|jobs|mil|mobi|museum|name|nato|net|org|pro|tel|travel|xxx)$\\b
You can also specify expression, caseSensitive and trim params as a OGNL expression, see the example below.
![]() | Warning Do not use ${regexExpression}, ${caseSensitiveExpression} and ${trimExpression} as an expression as this will turn into infinitive loop! |
<!-- Plain Validator Syntax --> <validators> <validator type="email"> <param name="fieldName">myEmail</param> <message>Must provide a valid email</message> </validator> </validators> <!-- Field Validator Syntax --> <field name="myEmail"> <field-validator type="email"> <message>Must provide a valid email</message> </field-validator> </field> <!-- Field Validator Syntax with expressions --> <!-- Only available when used with xml based configuration, if you want to have the same flexibility with annotations use @RegexFieldValidator instead --> <field name="myEmail"> <field-validator type="email"> <param name="regexExpression">${emailPattern}</param> <!-- will be evaluated as: String getEmailPattern() --> <param name="caseSensitiveExpression">${emailCaseSensitive}</param> <!-- will be evaluated as: boolean getEmailCaseSensitive() --> <param name="trimExpression">${trimEmail}</param> <!-- will be evaluated as: boolean getTrimEmail() --> <message>Must provide a valid email</message> </field-validator> </field>