Regex Generator - Build Regex Visually
Build regular expressions visually by toggling character classes, anchors, and quantifiers, with a live preview of matches in your text.
Character Classes
Anchors
Quantifier
Flags
Generated Regex
Live Preview
Hello World 123! test@example.com
How Does It Work?
Build a regular expression visually by toggling character classes (digits, letters, whitespace), anchors, and quantifiers. The tool assembles the regex pattern in real time and highlights all matches in your sample text, so you can verify the pattern works before using it in code.
Example
Toggle "lowercase", "uppercase", and "+" quantifier to get /[a-zA-Z]+/g, which matches one or more consecutive letters. Against "Hello World 123!", it highlights "Hello" and "World".
Common Use Cases
- Quickly generating regex patterns for form validation (emails, phone numbers, etc.).
- Learning how character classes, anchors, and quantifiers combine into patterns.
- Testing regex against sample data before integrating into JavaScript, Python, or other code.
- Building search-and-replace patterns for text editors and IDEs.
FAQs
What regex flavor does this generate?
JavaScript (ECMAScript) regex syntax, which is compatible with most modern languages and tools including browsers, Node.js, Python, and many text editors.
How do I copy the regex?
Click the copy icon next to the generated regex string. It copies the full pattern including the delimiters and flags (e.g. /pattern/g).
Can I generate a regex for email validation?
Toggle lowercase, digits, and the + quantifier, then add your own custom characters. For robust email validation, a hand-crafted pattern or a dedicated library is recommended over a simple character class approach.