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Regex Tester Online

Input

39 chars6 words2 lines

Output

193 chars23 words15 lines
ReadyRuns locally in the browser for fast, private text transformations.

About This Regex Tester Tool

Test regex patterns against text and inspect matches and capture groups. Regex Tester checks regular expression matches against sample text and reports match details. It is useful for debugging patterns before using them in code, logs, validation, or search workflows.

People often search for regex tester, regular expression tester, regex match online when they need a small task completed immediately. Instead of opening a heavy editor or writing a temporary script, you can use this page to check input, preview output, and keep changing the text until it matches the format you need. The tool is especially helpful when you are preparing data for code reviews, API requests, SQL queries, spreadsheet cleanup, content migration, or debugging sessions where a tiny formatting mistake can waste time.

How to Use It

  1. Paste sample text.
  2. Enter a regex pattern.
  3. Set flags such as global or case-insensitive.
  4. Review matches, indexes, and captures.

When This Tool Helps

  • You are writing a pattern for logs, IDs, emails, slugs, or validation rules.
  • You need to confirm capture groups before adding a regex to code.
  • You want to test global, case-insensitive, or multiline flags with sample text.

Common Use Cases

  • Testing log patterns.
  • Checking capture groups before coding.
  • Validating simple text patterns.
  • Designing find-and-replace regex safely.

Common Mistakes to Check

  • Forgetting the global flag when expecting multiple matches.
  • Not escaping special regex characters.
  • Using greedy patterns that match too much.
  • Testing on too little sample data.

Related Tools

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FAQ

Is my data private?

Your pasted text is processed locally in the page for the tool workflow. Avoid pasting secrets into any website unless you fully control the environment.

Can I bookmark this exact tool?

Yes. Each tool has its own indexable page with a direct URL, so you can bookmark the exact converter, formatter, decoder, or cleanup utility you use most.

Can it show capture groups?

Yes. Match output includes capture group information when available.

Can I test flags?

Yes. Enter flags such as g, i, or m.

Does it replace text?

Use Find and Replace when you want to apply replacements.