Visual Regex Builder
Build a regular expression by clicking blocks instead of memorising syntax. Test it live on your own text, see every match highlighted, and read a plain English explanation of what your pattern means.
| Token | Meaning |
|---|
Build or type a pattern to see each part explained.
How to use
- Click the blocks to build your pattern, or type directly into the pattern box. The validity line tells you instantly if the pattern has an error.
- Toggle the flags to change how matching works, for example
gfor all matches orito ignore case. - Paste your own test text and watch the matches highlight with a count.
- Read the explanation table to check each part of your pattern does what you intended.
Unlike a plain regex tester, this tool is built for learning: you assemble the pattern from blocks and get a plain English breakdown of every token. Nothing leaves your browser.
Frequently Asked Questions (FAQ)
How do I build a regex without typing the syntax?
Click the building blocks in each group: anchors, character classes, quantifiers and groups. Each click inserts the matching syntax into the pattern box at your cursor position, so you build the expression step by step without memorising the syntax.
Does it explain my pattern in plain English?
Yes. An explanation table breaks down what each token in your pattern does, and a live test shows match highlighting.
How do I know if my pattern is valid?
The builder checks your pattern as you type. If it is invalid, it shows the exact error message from the JavaScript engine, such as an unbalanced parenthesis, so you can fix it right away.
What do the flags g, i, m, s and u mean?
The g flag finds all matches instead of stopping at the first. The i flag ignores upper and lower case. The m flag makes the start and end anchors work per line. The s flag lets the dot match newlines too. The u flag enables full Unicode matching.