alternate_email
Email matcher
Capture standard email addresses from logs or text exports.
[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}
Regex Tester
Test regular expressions quickly with flag toggles, match tables, and capture-group visibility for debugging and validation.
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Compiled pattern
-
Match count
0
Mode
Global
| Match # | Group | Offset | Value |
|---|---|---|---|
| Run a regex to see matches. | |||
Transcript
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tips_and_updates
Quick regex examples
Use these starter patterns for email, URL, date, and price matching. Click apply to fill both pattern and test text.
link
URL finder
Extract full HTTP/HTTPS links from long text blocks.
https?:\/\/[\w.-]+(?:\.[\w.-]+)+(?:[\w\-._~:\/\?#\[\]@!$&'()*+,;=.]+)?
calendar_month
Date matcher
Find common date formats like YYYY-MM-DD or DD/MM/YYYY.
\b(?:\d{4}-\d{2}-\d{2}|\d{2}\/\d{2}\/\d{4})\b
paid
Price detector
Capture prices with optional currency symbol and decimals.
(?:[$€£₺]\s?)?\d{1,3}(?:[.,]\d{3})*(?:[.,]\d{2})?
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How to use regex tester
Enter a pattern, choose flags like case-insensitive or multiline, paste test text, and run the checker to inspect every match and group.
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Why use regex tester
Regex errors can be hard to debug in production logs. This tool gives deterministic pattern validation with offsets and match grouping, so developers can iterate faster and reduce parsing bugs.
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Regex testing details
Regex tester scope
This tool is built for developer and automation workflows where pattern correctness matters. It supports global and single-match modes, common regex flags, capture group listing, and offset inspection.
Practical debugging workflow
Use this tester before shipping filters, validators, route matchers, and text extraction pipelines. Validating patterns with real examples helps avoid silent failures and unexpected over-matching in production.
API-first consistency
All checks run through the shared tool API, so this regex engine output can be reused by future tools, CI diagnostics, and other internal developer workflows without logic duplication.
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Frequently asked questions
What does Regex Tester validate?
It validates regex syntax, executes pattern matching, and returns capture groups with offsets.
Can I test multiple matches at once?
Yes. Enable global match mode to return all occurrences instead of just the first match.
Which flags are supported?
The tester supports i, m, s, u, x, A, and D flags through a normalized and safe flag parser.
Why are offsets useful?
Offsets show exact character positions where each group matched, which helps when debugging parser logic.