Regex Tester
Test JavaScript regular expressions.
Private — runs in your browser Instant results
2 matches
123 456
Introduction
Your files and text are processed locally in your browser and are never uploaded.
What is Regex Tester?
Regex Tester helps you test javascript regular expressions. It belongs to the Testing group within software development tools on The Daily Tools. Processing happens locally in your browser.
Definition: Regex Tester is a free, browser-based developer utility for test JavaScript regular expressions.
How it works
- Configure the inputs shown in the Regex Tester form above.
- The tool applies the method described by its inputs and result labels.
- The result is generated locally in your browser; files and entered values are not sent to our servers.
- Use the related tools below when you need a different testing task.
Worked example
Example: Using the Regex Tester
Inputs: Enter values relevant to testing — for example, the measurements or amounts described in the tool fields above.
- Open the Regex Tester and review the input fields.
- Enter your values and review the instant result panel.
- Adjust inputs to compare scenarios side by side.
You receive an immediate test javascript regular expressions — useful for planning and comparison.
Use cases
- Working through a testing question with clear inputs
- Handling a file or text value that you prefer to keep on your device
- Using a focused tool instead of a general spreadsheet or manual calculation
Advantages
- Browser-based processing — entered values and selected files are not sent to our servers
- No account required
- Instant results with a clean, readable interface
Limitations
- Very large, corrupted, encrypted, or unsupported files and inputs may not process successfully
- Results are not saved by this tool after you leave or refresh the page
Documentation
Syntax: JavaScript RegExp — flags: g, i, m, s, u, y
Input: Pattern: \d{3}-\d{4} Text: Call 555-0199Output: Match array with groups and indices
Frequently asked questions
- Is the Regex Tester free to use?
- Yes. Regex Tester on The Daily Tools is completely free, requires no account, and runs entirely in your browser.
- Does The Daily Tools store my inputs?
- No. Your numbers and text never leave your device. The Daily Tools has no backend database for calculator inputs.
- Who should use the Regex Tester?
- Anyone who needs to complete a testing task locally in a browser.
- How accurate is the Regex Tester?
- The tool follows the selected format or processing method locally in your browser. It is not an estimate.
- Can I use the Regex Tester on mobile?
- Yes. The Daily Tools is fully responsive and works on phones, tablets, and desktops.
- Is my data sent to a server?
- No. Developer tools process text locally in your browser. Do not paste secrets into any website unless you understand its privacy model.
Sources & references
Key points
- Regex Tester is a free, browser-based developer utility for test JavaScript regular expressions.
- Test JavaScript regular expressions.
- Private, browser-only processing
- Private, browser-based processing