Regex Tester Guide Print

The Regex Tester in Cockpit lets you try a pattern against sample text, toggle common flags, and inspect match results without using an external regex site.

When to Use This

• You want to test a regular expression quickly.
• You need to compare how a pattern behaves with different flags.
• You want to count matches in a sample text block.
• You need a lightweight built-in regex workspace.

What the Tool Includes

• a field for the regex pattern
• checkboxes for common flags such as g, i, and m
• a test string area
• match output and match count

Steps

1. Open Tools.
2. Launch the Regex Tester.
3. Enter the regex pattern you want to test.
4. Select any flags you need.
5. Paste or type the test string.
6. Click Test Regex.
7. Review the matches and total count.

Expected Result

You should be able to see whether the pattern matches the input text, how many times it matches, and whether flags change the result the way you expect.

Common Mistakes

• Testing against the wrong sample: A pattern can look broken when the example text is not representative.
• Forgetting the flags: Case sensitivity and multiline behavior often change the result completely.
• Reading one match as success: Check the match count and output, not just whether something matched once.

Example Use Cases

• Pattern cleanup: An admin refines a regex before using it in another workflow.
• Case handling test: You compare results with and without the ignore-case flag.
• Input validation check: You test whether a pattern catches only the strings you actually want.

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