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Regex Tester

Test regular expressions against text with real-time matching and highlighting.

Regular Expression
Quick patterns
Matches

Overview

Test regular expressions and inspect matches quickly.

Best for

  • Validate formats like emails or IDs.
  • Extract patterns from logs.
  • Extract IDs from logs or filenames.

Step-by-step

  1. Enter your regex pattern and flags.
  2. Paste the test text.
  3. Review matches and groups.

Examples

Example 1
Input
Pattern: \b\d{4}-\d{2}-\d{2}\b | Text: 2025-03-01
Output
Matches: 2025-03-01
Finds ISO date strings.
Example 2
Input
Pattern: ([A-Za-z]+)@([A-Za-z.]+) | Text: info@example.com
Output
Groups: info / example.com
Captures local and domain parts.
Example 3
Input
Pattern: \b\d{3}-\d{2}\b | Text: 123-45, 678-90
Output
Matches: 123-45, 678-90
Global matching finds all codes.

Common mistakes

  • Greedy patterns may match too much.
  • Regex features differ across engines.
  • Missing the global flag returns only the first match.

Pro tips

  • Start with a small test string.
  • Use non-greedy quantifiers when needed.

FAQ

Why are there no matches?
Check flags, escaping, and line breaks.
Does this upload my data?
No. Everything runs locally in your browser.
Can I use it offline?
Yes. After the page loads, most tools work offline. Some assets (like fonts) may need a connection.

Data & privacy

All processing happens locally in your browser. No data is uploaded or stored.