Free Online Regex Master Composer
Free online visual regex builder. Construct complex patterns using blocks, presets, and real-time human explanations.
Initializing Module
Optimizing assets and preparing high-fidelity workspace...
How to use it
Think in Steps
Regular expressions are just sequences of parts. Add a block for each part of the text you want to match (e.g., '3 digits', then 'a dash', then 'any word').
Add & Reorder Blocks
Click on the icons (Digit, Letter, Wildcard) to add a new step. Use the up/down arrows on each block to change its position in the sequence.
Define Frequency
Use the 'Frequency' dropdown to set how many times a part should repeat. You can make parts optional, repeat exactly N times, or match within a range (e.g., 2 to 5 times).
Read the Human Translation
Under every block, the tool writes a simple English sentence explaining what that block does. If the sentence makes sense, your regex is likely correct!
Live Testing
Paste your actual text into the 'Interactive Sandbox'. Matches will be highlighted instantly. Once happy, copy the generated code for your programming language.
FAQ
?What are 'Smart Presets'?
Presets are pre-built blocks for complex patterns like Email addresses, URLs, and IP addresses. Instead of building them from scratch, just add a 'Smart Preset' block and select the type.
?How do Capture Groups work?
When you toggle 'Capture' on a block, the regex engine will remember that specific part of the match. This is useful for extracting data, like getting the 'username' part out of an email.
?What does the 'Negative (Not)' option do?
It tells the regex to match anything *except* what you defined in that block. For example, 'Not Digit' will match letters, spaces, and punctuation, but not numbers.
?Do I need to escape characters like dots or slashes?
No. When you use the 'Exact Text' block, the tool automatically handles all special regex characters (like . * + ?) so they match as literal text.
Need a custom tool?
We're constantly adding new tools. Suggest one or report a bug.
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The ultimate visual regex builder for developers and beginners alike. Build complex regular expressions using a modular block-based interface. Features smart presets for common patterns (Emails, URLs, IPs), visual quantifiers, and real-time English explanations of your patterns. Perfect for reverse-engineering or building robust patterns without memorizing syntax.