Regular Expressions

Regex examples for validating date strings such as dd.MM.yyyy HH:mm:ss and yyyy-MM-dd HH:mm in forms and text input.

A password validation regex for forms that require uppercase, lowercase, digit and special character rules.

A regular expression for checking the shape of an e-mail address in website forms, plus notes on what validation can and cannot prove.

A concise regex example for removing repeated blank lines from text files, form input or copied content.