Online Regex Tester Tool

Regex Tester

Test, debug, and understand your regular expressions in real-time with our powerful tool

Regular Expression

Pattern:

Test String: The quick brown fox jumps over the lazy dog. Regular expressions are powerful! Testing words like: apple, banana, cherry, date, and fig.

Flags:

i (case-insensitive) g (global match) m (multiline) s (dotall) u (unicode)

Results

0

Matches Found

0

Groups Captured

0ms

Processing Time

Match Visualization:

Run a test to see highlighted matches...

Detailed Results:

Detailed match information will appear here...

Regex Guide & Reference

Basic Patterns

• . - Any single character
• \d - Digit (0-9)
• \w - Word character (a-z, A-Z, 0-9, _)
• \s - Whitespace (space, tab, newline)
• [abc] - Any of a, b, or c
• [^abc] - Not a, b, or c
• \b - Word boundary
• \t - Tab character

Quantifiers

• * - 0 or more
• + - 1 or more
• ? - 0 or 1
• {3} - Exactly 3
• {3,} - 3 or more
• {3,5} - Between 3 and 5
• *? - Lazy quantifier (as few as possible)

Groups & Lookarounds

• (abc) - Capture group
• (?:abc) - Non-capturing group
• a(?=b) - Positive lookahead
• a(?!b) - Negative lookahead
• (?<=a)b - Positive lookbehind
• (? - Negative lookbehind
• \1 - Backreference to first group

Anchors & Special

• ^ - Start of string
• $ - End of string
• \b - Word boundary
• \A - Start of string
• \z - End of string
• \n - New line
• \x20 - Hexadecimal character

Feature	Details
Price	Free
Rendering	Client-Side Rendering
Language	JavaScript
Paywall	No

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About This Tool

How It Works?