Test, validate and match regular expressions
This regular expression is designed to validate email addresses by checking for a standard structure: a local username, an '@' symbol, and a domain name ending with a valid top-level domain (TLD). It allows alphanumeric characters, hyphens, plus signs, underscores, and dots in both the local and domain parts. The TLD is specifically required to be an alphabetic string of at least two characters. It is commonly used in web forms and backend validation to ensure user input conforms to typical email formatting rules.