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Regex Tester

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Test and debug regular expressions with live matching and highlighting.

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4.5(127 ratings)

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How to Use

1

Enter regex

Type your regular expression pattern.

2

Enter test string

Paste the text you want to test against.

3

View matches

See highlighted matches and capture groups.

Features

Live matching
Syntax highlighting
Capture groups
Multiple flags (g, i, m)
Match count

Frequently Asked Questions

A regular expression (regex) is a sequence of characters that defines a search pattern. It's used for string matching and text manipulation.

Regular expressions are one of the most powerful text-processing tools in a developer's arsenal. Our regex tester provides real-time matching, syntax highlighting, and detailed explanations to help you craft and debug patterns with confidence. Test against multiple inputs simultaneously.

Did You Know?

Regular expressions were developed by mathematician Stephen Kleene in the 1950s. The term 'regex' became popular with Unix text processing tools in the 1970s!

  • Use \d for digits, \w for word characters, \s for whitespace
  • The ? makes the preceding quantifier lazy (non-greedy)
  • Use capturing groups () to extract specific parts of matches
  • Test edge cases: empty strings, special characters, unicode

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