Hello there! Did you know that every piece of information we enter into a web form gets validated by running verifications systems using regex? Regex is a special sequence of characters that must be matched in a string or document. By validating user input it can make our accounts secured, or make sure our Amazon packages get delivered to the correct address or even making sure our emails and passwords have the correct symbols, letters, and numbers in them. If you have encounter any of these most likely you have encounter regEx or regExp (Regular Expression).