🧩 Free Regex Tester

Test, visualize, and generate regex patterns instantly across multiple programming languages.

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📖 Complete Regex Guide & Examples


Learn all common regex patterns, syntax, and examples with test text.


1. Characters & Classes


    

  • 
a, 1, @ — match literal characters
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  • 
. — match any character except newline
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  • 
[abc] — match 'a', 'b', or 'c'
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  • 
[a-z] — lowercase letters
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  • 
[^abc] — negation
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  • 
\d — digits; \D — non-digits
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  • 
\w — word characters; \W — non-word
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  • 
\s — whitespace; \S — non-whitespace
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2. Anchors


    

  • 
^ — start of line
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  • 
$ — end of line
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  • 
\b — word boundary; \B — non-word boundary
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3. Quantifiers


    

  • 
* zero or more; + one or more; ? optional
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  • 
{n} exact n times; {n,} at least n; {n,m} between n and m
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4. Groups & Captures


    

  • 
(abc) — capture; (?:abc) — non-capture
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  • 
\1, \2... — backreference
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5. Alternation / OR


    

  • 
cat|dog — match either cat or dog
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6. Escaping Special Characters


    

  • 
\. — literal dot
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  • 
\* — literal star
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7. Lookahead / Lookbehind


    

  • 
(?=pattern) positive lookahead
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  • 
(?!pattern) negative lookahead
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  • 
(?<=pattern) positive lookbehind
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  • (? negative lookbehind
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8. Common Examples


  

    

  • Email: [\\w.-]+@[\\w.-]+\\.[A-Za-z]{2,} → test@example.com
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  • Phone: \\+?[0-9]{10,15} → +12345678901
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  • Date YYYY-MM-DD: \\d{4}-\\d{2}-\\d{2} → 2025-11-05
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  • Hex Color: #([0-9a-fA-F]{3}|[0-9a-fA-F]{6}) → #fff, #abcdef
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  • IP: (?:\\d{1,3}\\.){3}\\d{1,3} → 192.168.0.1
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  • Time HH:MM: ([01]?\\d|2[0-3]):[0-5]\\d → 13:45
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  • URL: https?:\\/\\/[\\w.-]+ → https://example.com
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❓ Frequently Asked Questions (FAQ)


Q: How do I match an email address?


A: Use [\\w.-]+@[\\w.-]+\\.[A-Za-z]{2,}. Test in the input above.


Q: Can I match multiple lines?


A: Check "Global search" or add flags in your code. "^" and "$" respect line positions.


Q: What is the difference between \\d and \\w?


A: \\d matches digits 0-9, \\w matches letters, digits, and underscore.


Q: How do I escape special characters?


A: Use a backslash: \\., \\*, \\?.