Regular expression for validating email address
Email:: Address can be used to extract a list of e-mail addresses from a given string.For example: examples/email_It properly verifies if an e-mail is valid, it even removes unnecessary white-spaces from both ends of the e-mail address, but it cannot really verify if the given e-mail address is really the address of someone, and if that someone is the same person who typed it in, in a registration form.These can be verified only by actually sending an e-mail to that address with a code and asking the user there to verify that indeed s/he wanted to subscribe, or do whatever action triggered the email validation.With that said, there might be cases when you cannot use those modules and you'd like to implement your own solution using regular expressions.Restrictions in above regex are:1) A-Z characters allowed 2) a-z characters allowed 3) 0-9 numbers allowed 4) Additionally email may contain only dot(.), dash(-) and underscore(_) 5) Rest all characters are not allowed Let’s test some email addresses against above regex.List emails = new Array List(); emails.add("[email protected]"); emails.add("[email protected]"); emails.add("[email protected]"); emails.add("[email protected]"); emails.add("[email protected]"); emails.add("[email protected]"); emails.add("[email protected]"); //Invalid emails emails.add("@yahoo.com"); String regex = "^[A-Za-z0-9 _.-] @(.Validating email is a very important point while validating an HTML form. You can modify or rewrite the said regular expression. In this page we have discussed how to validate an email using Java Script : An email is a string (a subset of ASCII characters) separated into two parts by @ symbol.
In various use-cases, but especially at web-based registration forms we need to make sure the value we received is a valid e-mail address.
a "personal_info" and a domain, that is [email protected] The length of the personal_info part may be up to 64 characters long and domain name may be up to 253 characters. The personal_info part contains the following ASCII characters.