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Regex Tester
/ /
g global i ignore case m multiline s dotall u unicode
Test String
Ready
Matches
0
Enter a pattern and test string to see matches
Pattern Library
Email Address
[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}
URL
https?://(www\.)?[\w-]+(\.[\w-]+)+...
Phone (US)
\d{3}[-.]?\d{3}[-.]?\d{4}
Date (YYYY-MM-DD)
\d{4}-\d{2}-\d{2}
Hex Color
#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3})
IPv4 Address
(?:25[0-5]|2[0-4]\d|[01]?\d\d?)...
ZIP Code (US)
\d{5}(-\d{4})?
Capitalized Word
[A-Z][a-z]+
Number (int or decimal)
\b\d+\.?\d*\b
HTML Tag (with content)
<([a-z][a-z0-9]*)\b[^>]*>...

About Regex Tester

This regex tester helps developers build, validate, and debug regular expressions with instant match feedback, capture group inspection, flag testing, and common pattern examples.

Key Features

  • Test regular expressions with immediate match feedback.
  • Toggle common regex flags during debugging.
  • Use match details to refine patterns for forms, APIs, and text processing.

How To Use Regex Tester

  1. Enter a regular expression and choose the flags you want.
  2. Paste sample text to test matching behavior.
  3. Adjust the pattern until the expected matches are highlighted correctly.

Regex Tester FAQs

Can I test regex flags here?

Yes. The regex tester supports common flags so you can inspect how matching changes under different conditions.

Who is this tool for?

It is useful for developers, testers, and learners working with validation rules, text parsing, and search patterns.

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