Regex Tester Online

How to use the Regex Tester

Use this tool to test and debug regular expressions directly in your browser.

1. Enter your regex pattern in the pattern field
2. Add flags if needed (g, i, m, s, u)
3. Paste your test text
4. Matches will be highlighted instantly
5. Adjust your pattern until results are correct

Everything runs client-side in your browser. No uploads. No tracking of your input.

Common Regex Examples

Below are frequently used regex patterns for validation and text matching. Copy, paste, and tweak as needed.

Email validation

^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-z]{2,}$

Use case: validate user email input.

Strong password

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[^A-Za-z0-9]).{8,}$

Use case: enforce strong password requirements.

URL matching

^(https?:\/\/)?([\w-]+\.)+[\w-]+(\/[^\s]*)?$

Use case: detect links in text.

Phone number

^\+?[0-9][0-9\s().-]{7,}$

Use case: basic international phone validation.

Date (YYYY-MM-DD)

^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12]\d|3[01])$

Use case: validate ISO date formats.

Frequently Asked Questions

Where Regex Is Used

Regular expressions are used across many areas of development:

• form validation
• search and replace
• log parsing
• web scraping
• data cleaning
• API input validation
• text processing

Related Tools

You may also find these useful:

• JSON Validator
• GUID Generator
• convert-json-to-csv