We’ve all been there. You need to validate an email address, or extract a specific pattern from a log file, or sanitize user input in a security-sensitive backend. You know you need a regular expression. You open your favorite regex playground, type in ^\w+, realize it’s not quite right, tweak it, test it, break it, tweak it again, and eventually copy-paste it into your codebase.
The problem isn’t just that writing regex is hard. It’s that reading and explaining regex is even harder. A week later, when a bug surfaces because the regex didn’t handle a hyphenated name, you stare at that string of symbols and wonder what you were thinking.
I built RegexBuilder to solve the "what was I thinking?" problem, but with a specific constraint: I wanted it to work entirely in your browser, with zero data leaving your machine.
The Wedge: Privacy-First, Real-Time Explanation
Most regex tools are simple validators. You type a pattern, you type a test string, and you get a green check or a red X. Some fancier ones highlight matches. But they don’t help you understand why a pattern works or fails, and they certainly don’t help you write the pattern in the first place.
