Regex Tester & Validator

This regular expression validates email addresses by ensuring the standard structure of a local part, an '@' symbol, and a domain part. It allows alphanumeric characters and underscores, along with optional dots or hyphens within the local and domain sections. The top-level domain (TLD) is required to be between 2 and 63 characters long. It is commonly used for validating user input in forms and contact fields.