Regex Tester
Test regex patterns with flags, live matches and highlighted results.
Flags
Active: g
Test text
96 characters
Matches
Run the test to see matches and text highlighting.
100% local processing in your browser
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Benefits
- Validates regex quickly.
- Shows clear errors for invalid patterns.
- Includes visual highlighting for matches.
Practical value of Regex Tester
Regex Tester belongs to the encoding tools collection and is designed as a focused utility with crawlable context, clear limits and a direct result.
- Practical use
- This utility converts common formats used in URLs, data, QR and technical content to validate integrations with less friction.
- Privacy and scope
- 100% local processing in your browser
- Result quality
- The tool surfaces input errors and keeps the output clear for copying, downloading or review.
Related tools
- Base64 Encode/DecodeEncode and decode Base64 strings for APIs, tokens, payloads and data exchange.
- HTML MinifyMinify HTML in seconds with compact output ready to copy.
- CSS MinifyMinify CSS by removing comments and unnecessary whitespace.
- JS MinifyMinify simple JavaScript snippets in a fast browser workflow.
- Base64 to ImageDecode Base64 image strings and export them as downloadable image files.
- Image to Base64Convert image files into Base64 strings with optional data URL prefix.
Frequently asked questions
Which flags are supported?
g, i, m, s and u.
Is test text sent to a server?
No. Everything runs in the browser.
Test regular expressions with real-time feedback
Regex Tester speeds up pattern debugging for validation, extraction and text processing workflows.
Use live match highlighting to iterate expressions quickly and reduce implementation errors.