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Regex Tester

Test and perfect your Regular Expression (Regex) patterns instantly with accurate Highlight Groups, 100% client-side.

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/gim
Welcome to the Regex Tester & Playground! You can test your regular expressions here against any text. Example emails to match and extract groups from: 1. Primary Contact: hello@toolhub.com 2. Customer Support: help@toolhub.my.id Extra dummy data: Numbers: 12345, 67890 Dates: 2026-04-11, 04/11/2026
NoIndexFull Match StringCapture Groups
1173 — 190
hello@toolhub.com
G1hello
G2toolhub
G3com
2212 — 230
help@toolhub.my.id
G1help
G2toolhub.my
G3id

Regex Tester: Test and Debug Your Regular Expression Patterns

Regular Expression (Regex) is a secret weapon for developers to validate text, process data, and perform complex info extractions. However, writing Regex patterns often becomes a puzzle difficult to solve without visualization assistance.

Regex Tester by Tool Hub is designed to provide immediate Live Feedback as you construct patterns. With group highlighting and instant match detection, you can perfect your email validation logic, string processing, or raw data cleaning without constantly rerunning your code. Your privacy is maintained as all Regex tests are executed purely within your browser.

How to Tweak and Test Regex

  1. Insert Regex Pattern:Write your regular expression pattern (e.g., ^[a-z]+$) in the pattern input box.
  2. Input Test Text:Paste the text or paragraph you want to use for testing in the text area.
  3. Observe Visual Highlights:The system will intelligently color segments of text that match (Matches) your pattern.
  4. Select Expression Flags:Adjust flags such as Case Insensitive (i) or Global (g) to customize search scopes.

Regex Tester Functionalities

  • ✔
    Instant Highlighting

    Direct visualization of text segments captured by the Regex pattern.

  • ✔
    Pattern Error Detection

    Provides warnings if the written Regex syntax is invalid.

  • ✔
    Standard Compatibility

    Works according to stable and reliable JavaScript Regex engines.

Regex Utilities for Programmers

  • Form Input Validation:Ensuring email formats, phone numbers, or passwords comply with established rules.
  • Data Scraping Cleanup:Removing HTML tags or special characters from raw scraped data.
  • Code Refactoring:Massively searching and replacing specific text patterns within project files.

FAQ - Regular Expressions

Q: What does the "g" flag do in Regex?

A: The "g" flag stands for Global, meaning the system will find all matches throughout the text instead of stopping at the first find.

Q: Is this Regex tester safe for private data?

A: Yes, as no data is sent to the internet. All processing is handled by the Regex engine in your own browser.