Developer Utility
Regex Tester Tool
Test patterns and flags against live sample text.
Language: RegexUtility: ValidateUtility: Inspect
Match count: 2 #1: alice@example.com (index: 0) #2: bob@company.org (index: 23)
What This Tool Does
Test regex behavior live with flags and sample text before shipping brittle validation logic.
Use it to inspect or transform input quickly, then carry validated output into code, tests, or API requests.
Common Use Cases
- Validate user-input patterns in forms.
- Debug failed text extraction rules.
- Verify capture group behavior in parsing scripts.
Common Pitfalls
- Complex patterns can backtrack heavily.
- Regex alone is not ideal for all parsing tasks.
FAQ
Does it support global and multiline flags?
Yes, standard JavaScript flags are supported.
Can I trust regex for strict URL validation?
Prefer parser libraries for strict URL validation.
Does this tool send data to a backend?
Most tools process input client-side in your browser unless explicitly noted.