Createuserwizard emailregularexpression

A very specific request!

The Create User Wizard in.NET uses a regular expression to validate the email address entered by the user. The default regular expression used is:

^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z0-9\-]+\.+)+.[a-zA-Z]{2,}))$

This regular expression matches most common email address formats, including:

• Local part (before the @ symbol): alphanumeric characters, underscores, hyphens, and periods
• Domain (after the @ symbol): IP address or a domain name with one or more labels separated by dots
• Top-level domain (after the last dot): at least two characters long

Here's a breakdown of the regular expression:

• ^ matches the start of the string
• ([a-zA-Z0-9_\-\.]+) matches one or more of the following characters: letters (both uppercase and lowercase), numbers, underscores, hyphens, and periods
• @ matches the @ symbol
• ((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z0-9\-]+\.+)+.[a-zA-Z]{2,})) matches either:
  • An IP address in the format xxx.xxx.xxx.xxx (where x is a digit)
  • A domain name with one or more labels separated by dots, where each label is at least two characters long and contains only letters, numbers, and hyphens
• $ matches the end of the string

Keep in mind that this regular expression does not validate whether the email address actually exists or is in use. It only checks the format of the email address.