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Regex Tester

Test, debug, and visualize regular expressions in real-time β€” no lag, instant results

Regular Expression
Test String
Match Results
0 matches
Enter a regex pattern above to see matches highlighted...
Common Patterns (click to use)
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How to Use Regex Tester

Test, debug, and master regular expressions β€” complete developer guide

Step-by-Step Guide

⚑ Test Regular Expressions in 3 Simple Steps

1
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Enter Your Pattern

Type your regex pattern (e.g., \b\d{3}-\d{2}-\d{4}\b) in the Regular Expression field. Use common patterns from the chips below.

2
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Add Test Text

Paste or type the text you want to search in the Test String area. The matches will be highlighted in real-time as you type.

3
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Copy Results

Click Copy Matches to save all matched values. Use the flags (g, i, m, s, u) to modify how your regex behaves.

Why Use Regex Tester

Regular expressions (regex) are powerful patterns for searching, matching, and manipulating text. They're essential for validation, parsing, search/replace, and data extraction in programming.

Key features include: real-time matching with visual highlighting, support for all regex flags (g, i, m, s, u), capture group extraction, common pattern library, error detection, and 100% client-side processing.

Regex TesterRegular ExpressionRegex MatcherPattern Testing Regex DebuggerText ProcessingDeveloper ToolPattern Matching
Frequently Asked Questions

❓ Everything You Need to Know

πŸ”What are regex flags and what do they do?β–Ό

g (global) β€” find all matches, not just the first. i (case-insensitive) β€” ignores case when matching. m (multiline) β€” treats ^ and $ as line boundaries. s (dotall) β€” allows . to match newlines. u (unicode) β€” enables full Unicode support.

🎯What are capture groups?β–Ό

Capture groups () extract specific parts of a match. For example, in (\d{3})-(\d{2})-(\d{4}), each set of numbers becomes a separate captured group. Our tool displays all captured groups for each match.

πŸ”’Is my data safe?β–Ό

Yes! All regex testing happens locally in your browser. No patterns or text are ever sent to any server β€” your data stays completely private.

⚑Is this tool free?β–Ό

100% free β€” no signup required! Test unlimited regex patterns. No hidden fees, no premium tiers. We believe essential developer tools should be accessible to everyone.