Regex Tester & Matcher

Write, test, and debug your Regular Expressions instantly.

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Test String

Match Result 0 Matches

Extracted Matches

No matches found.

Free Online Regex Tester, Matcher, and Debugger

Build, test, and troubleshoot your Regular Expressions easily with real-time highlighting and extraction. Perfect for developers, data analysts, and webmasters.

Regular Expressions (Regex) are an incredibly powerful tool for searching, validating, and manipulating text. However, writing the perfect regex pattern can be a frustrating process of trial and error. The Online Regex Tester & Matcher by DoItToolz provides a seamless, visual environment to build your patterns and immediately see how they interact with your target text.

🔒 100% Secure & Private: Security is crucial when working with sensitive logs, emails, or user data. This tool processes your regex patterns and test strings entirely locally inside your browser (Client-Side). Your data is never sent to our servers.

Frequently Asked Questions (FAQs)

What is a Regular Expression (Regex)?

A Regular Expression is a sequence of characters that forms a search pattern. It is used in programming to check if a string contains a specific pattern (validation), to extract parts of a string, or to replace text dynamically.

What do the Regex flags (g, i, m) mean?

Flags change how the expression is evaluated. 'g' (Global) makes the expression search for all matches rather than stopping at the first one. 'i' (Case-Insensitive) ignores uppercase and lowercase differences. 'm' (Multiline) allows the start (^) and end ($) anchors to match the start and end of lines, rather than the whole string.

Which Regex flavor does this tool support?

This tool runs on the standard JavaScript (ECMAScript) Regular Expression engine. It supports all standard features including lookaheads, lookbehinds, capturing groups, and character classes.

Common Regular Expression Examples

If you are new to Regex or need a quick snippet for your code, here are some of the most commonly used patterns:

  • Email Validation: ^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$
  • URL Matching: https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)
  • Extracting Numbers Only: \d+ (Use with the 'g' flag to extract all numbers from a text).
  • Strong Password Check: ^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]{8,}$ (Requires minimum 8 characters, at least one letter and one number).

Why Use a Visual Regex Debugger?

Writing regex blindly in your code editor often leads to edge-case bugs. By using our visual matcher, you can paste varying test cases into the "Test String" box and watch the highlights update in real-time. The "Extracted Matches" list also ensures that your capturing groups are returning exactly what your application expects, saving you hours of debugging time.

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