ChlatWork

ChlatWork

Regex Tester

Test JavaScript regular expressions, toggle flags, and inspect matches.

Flags

Expression

/\b\w+@\w+\.\w+\b/gm

Match preview

2 matches
Email hello@chlatwork.com or support@example.com for help.

Matches (2)

IndexMatchGroups
6hello@chlatwork.com-
29support@example.com-

Tool introduction

What Regex Tester does

The Regex Tester lets you try a JavaScript regular expression against sample text. It shows matches, groups, and flags so you can understand what the pattern is doing.

It is useful before adding regex to validation, search, parsing, log checks, import scripts, or frontend forms.

Privacy and processing

How your input is handled

  • Your data is processed in your browser where possible. We do not intentionally store your files or input on our server.
  • Review the output before using it for business, school, customer, or public workflows.

How to use Regex Tester

  1. 1Open the Regex Tester.
  2. 2Enter your regular expression pattern.
  3. 3Select the flags you need, such as global or ignore case.
  4. 4Paste realistic test text into the test string box.
  5. 5Review matches and capture groups.
  6. 6Adjust the pattern until it matches exactly what you expect.

Practical use cases

  • A developer tests an email-like pattern before adding form validation.
  • A backend engineer checks log lines for transaction IDs.
  • A data entry team validates invoice codes before import.
  • A QA tester confirms a search pattern works with Khmer and English text.
  • A student learns how capture groups change regex output.

Tips and limitations

Use real sample data, including edge cases and bad input.

Start simple, then add stricter rules.

Be careful with greedy patterns that match too much text.

Use anchors when you need the entire input to match.

Do not rely only on regex for security-sensitive validation.

FAQ

Which regex flavor does the tool use?

It is designed around JavaScript regular expressions, so behavior should match browser JavaScript.

What does the global flag do?

The global flag finds all matches instead of stopping after the first match.

Can regex validate emails perfectly?

Regex can catch obvious format issues, but full email validation is more complex than one simple pattern.

Why does my regex match too much?

The pattern may be greedy or missing anchors. Test with smaller examples and tighten the expression.

Can I copy matches?

Yes. The tool includes copy support for matched output.

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