RegExp Pattern Sample Generator (Mock Matches)
Local ProcessingGenerate synthetic sample strings that conform to common regular expression patterns (digits, lowercase, alphanumeric, UUID, hex).
How It Works & Processing Standards
Generate synthetic sample strings that conform to common regular expression patterns (digits, lowercase, alphanumeric, UUID, hex).
Tool processing runs in your browser. If you create a calculator or conversion share link, its values are included in the URL. See the privacy policy for account, analytics and advertising data.
Current Limits
- Maximum input length: 100,000 characters
For sample values when testing input validation or forms. Pick one of five common patterns and a count to get random values in that shape.
It does not take arbitrary regular expressions; only the five built-in patterns.
What You Can Do
- Five fixed patterns
- 4 digits, 8 lower-case letters, 12 alphanumerics, UUID v4, 32 hex.
- Many at once
- As many as you need.
How to Use RegExp Pattern Sample Generator (Mock Matches)
- 1Pick a patternOne of the five.
- 2Set the countHow many values.
- 3CopyCopy the samples.
Examples
Common Use Cases
- Testing verification-code or code input fields
- Checking a validation regex
Frequently Asked Questions (FAQ)
Can a 4-digit value start with 0?
Yes. Values come from 0000–9999, so leading zeros appear — useful for testing that inputs keep them.