CCalcBOX
🌐JA
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Regex Tester

Test regular expressions in real-time with match highlighting.

Regex Pattern

//g
Flags:

Common Patterns

Test Text

Replace Mode

About Regex Tester

A tool for testing JavaScript-compatible regular expressions in real time. Features match highlighting, group info, and replacement.

Flags: g=Global search, i=Case insensitive, m=Multiline mode, s=dotAll mode (. matches newlines)

📖How to Use
  1. 1Enter a regex pattern in the pattern field
  2. 2Type test text to see matching parts highlighted in real time
  3. 3Toggle flags (g, i, m) to change matching behavior
💡Tips & Knowledge
  • •\d = digit, \w = word character, \s = whitespace. These cover most basic patterns
  • •(?:...) is a non-capturing group — more efficient than capturing groups when you don't need the match
  • •Reuse tested regex patterns for email/phone validation across projects

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All calculations run in your browser. No data is sent to any server.