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Regex Tester Online – Test, Debug & Learn Regular Expressions Easily

#webdev #programming #javascript #regex

🧪 Online Regex Tester – Test & Debug Regular Expressions Instantly

Regular expressions are powerful — but debugging them can be frustrating.

If you need a fast and simple way to test, debug, and validate regex patterns, try this free online tool:

👉 https://www.simplefiletools.com/regex-tester

What Is a Regular Expression (Regex)?

A regular expression (regex) is a sequence of characters that defines a search pattern.

Regex is commonly used for:

  • Input validation
  • Search and replace
  • Data extraction
  • Log analysis
  • Form validation

You’ll find regex in almost every programming language.

Why Use an Online Regex Tester?

Writing regex without testing can lead to:

  • Incorrect matches
  • Missed edge cases
  • Performance issues

An online regex tester helps you:

  • Validate patterns instantly
  • See real-time matches
  • Debug complex expressions
  • Save development time

Features of SimpleFileTools Regex Tester

  • Free and browser-based
  • No signup required
  • Instant match highlighting
  • Supports common regex syntax
  • Clean and distraction-free UI
  • Fast and lightweight

Try it here:
👉 https://www.simplefiletools.com/regex-tester

How to Use the Regex Tester

  1. Enter your regex pattern
  2. Paste the test string
  3. Instantly see matched results
  4. Adjust your pattern in real time

No refresh, no delay.

Example

Regex Pattern 

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

test@example.com
invalid-email@
user.name@domain.co
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Result

Matches only valid email addresses.

Common Use Cases

  • Email validation
  • Phone number matching
  • URL validation
  • Log parsing
  • Data cleaning
  • Search & replace testing

Who Is This Tool For?

This tool is useful for:

  • Developers
  • QA engineers
  • Students
  • Data analysts
  • Anyone working with text patterns

If you write regex often, this tool is a must-have.

Privacy & Performance

  • No input data is stored
  • Runs entirely in the browser
  • Fast and secure
  • Works on any device

Try the Regex Tester Now

Test and debug regex patterns instantly:

👉 https://www.simplefiletools.com/regex-tester

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