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    1. Home
    2. Tools
    3. Developer & Productivity Tools
    4. Regex Tester
    Developer & Productivity Tools

    Regex Tester

    Build and test your regular expressions in real-time with instant match highlighting.

    Regex Tester tool illustration

    Regular Expression

    Test String

    Contact us at support@example.com or for sales, email sales@example.org. Invalid: user@.com

    Match Information

    #MatchIndex
    No matches found.

    Regex Cheat Sheet

    Common Tokens

    .

    Any character except newline

    \w

    Any word character (a-z, A-Z, 0-9, _)

    \W

    Any non-word character

    \d

    Any digit (0-9)

    \D

    Any non-digit

    \s

    Any whitespace character

    \S

    Any non-whitespace character

    Anchors

    ^

    Start of the string

    $

    End of the string

    \b

    Word boundary

    \B

    Non-word boundary

    Quantifiers

    *

    0 or more times

    +

    1 or more times

    ?

    0 or 1 time

    {n}

    Exactly n times

    {n,}

    At least n times

    {n,m}

    Between n and m times

    Groups & Ranges

    (...)

    Capture group

    [abc]

    Any of a, b, or c

    [^abc]

    Not a, b, or c

    [a-z]

    Any lowercase letter

    What Are Regular Expressions (Regex)?

    A regular expression (or regex) is a sequence of characters that specifies a search pattern. It's like a super-powered version of the "Find" command you use in a word processor. Developers use regex to validate user input (like checking if an email address is in a valid format), parse text, perform advanced find-and-replace operations, and much more.

    How This Tool Helps

    • Instant Feedback: As you type your regex pattern, the tool immediately highlights all the matches in your test string, so you can see the effect of your changes in real-time.
    • Match Information: Get a clear list of all the matches found, including their index and any capture groups.
    • Error Highlighting: If your regex pattern contains an error, the tool will alert you so you can fix it quickly.
    • Built-in Cheat Sheet: Not sure how to match a specific character or group? The included cheat sheet provides a quick reference for the most common regex tokens.

    Frequently Asked Questions (FAQs)

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    Why Choose CodingMantra for Your Digital Needs?

    Privacy-First Architecture

    Browser utilities process data locally. When you choose to save a logo or document to your account, it is stored for reuse. AI tools send the inputs needed to generate your results.

    Advanced AI Integration

    We leverage the latest generative AI models (including Gemini and OpenRouter) to provide state-of-the-art capabilities like product photography generation, virtual try-ons, and high-converting marketing copy.

    Developer-Centric Utilities

    Built by developers for developers, our productivity suite includes essential utilities for JSON formatting, Regex testing, and security key generation, all optimized for a fast and seamless workflow.

    Tools for everyday work

    We believe in democratizing high-end technology. CodingMantra provides browser utilities and credit-based AI tools, helping small businesses and independent creators compete with larger enterprises.