One thing that web developers aren’t very good at, is allowing people to correctly spell their own names in forms. Let’s see how we can improve things!

Regular Expressions can be complicated as the expression gets longer. However, the individual pieces are simple. There’s just a lot of them.  Below is a table of the more common characters available. All the available escape sequences are documented on php.net. Syntax Meaning Syntax Meaning  \d any decimal digit: 0-9  \D any character that is … Read more » Regex Basics: The Syntax

Regular Expressions, or RegEx, are a must have skill. This tutorial will help you learn them, by analyzing a regex to validate if a number is between 0 and 255.