Free browser-based text tool

Regex Tester

Test regular expressions against text, view matches, inspect capture groups, try regex flags, preview replace output, and debug patterns for development, data cleaning, validation, logs, and automation.

Regular expression

Match results

1 matches
Order ID: INV-1001 Email: support@shbstores.com Phone: +971501234567 Website: https://www.shbstores.com Amount: AED 250.00

Matches and groups

Match 1

Text: support@shbstores.com

Index: 26

Replace preview

Order ID: INV-1001
Email: [EMAIL]
Phone: +971501234567
Website: https://www.shbstores.com
Amount: AED 250.00
giFlags
1Matches
122Text characters
41Pattern length

Test regular expressions online

Regular expressions, often called regex, are patterns used to search, match, validate, extract, and replace text. Regex is commonly used in JavaScript, Python, SQL tools, spreadsheets, text editors, log analysis, form validation, data cleaning, API processing, automation scripts, and backend development.

This regex tester helps you enter a pattern, test it against sample text, highlight matches, inspect capture groups, try common flags, preview replacement output, and copy the matching values. It is useful when you are building validation rules, extracting IDs from logs, finding emails or URLs, cleaning imported data, or preparing search-and-replace patterns.

Regex match tester

Test whether your regular expression matches the expected parts of your text.

Capture group viewer

Inspect capture groups and understand what each group returns.

Regex replace preview

Preview how text will look after replacing matches with your replacement value.

Private workflow

The regex test is designed to run in your browser without account creation.

Common regex flags

  • g: Global search. Finds all matches instead of only the first match.
  • i: Ignore case. Matches uppercase and lowercase letters without case sensitivity.
  • m: Multiline mode. Changes how ^ and $ behave across multiple lines.
  • s: Dot all mode. Allows . to match newline characters.
  • u: Unicode mode. Improves handling of Unicode characters.

Useful regex examples

Email

Use an email pattern to find addresses in text, logs, forms, or imported lists.

URL

Find links beginning with http or https in text content.

Numbers

Extract quantities, prices, IDs, phone parts, or numeric values from messy text.

Invoice IDs

Match business references such as INV-1001, PO-2026, or custom document numbers.

When to use a regex tester

  • Before adding validation rules to a form.
  • Before using find-and-replace on important text or code.
  • When extracting emails, URLs, IDs, prices, or codes from large text.
  • When debugging automation scripts, Apps Script, JavaScript, Python, or SQL cleanup logic.
  • When learning how capture groups and flags change the result.

FAQ

Is this regex tester free?

Yes. You can test regex patterns for free without creating an account.

Does it support JavaScript regex?

Yes. The tester uses JavaScript regular expression syntax.

Can I test replacement output?

Yes. Enter replacement text and preview the replaced result.

Is my text uploaded?

The tool is designed to process text in your browser.