Test Text with a RegExp
Check whether the text matches a regular expression. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Test Text with a RegExp
- 1. Paste the text to test. Paste the text you want to check into the input pane, such as a single value or a longer passage you suspect contains a match.
- 2. Enter the pattern and case rule. Type your pattern into Regular expression, and toggle Case sensitive depending on whether the check should distinguish uppercase from lowercase letters.
- 3. Read the match result. Read the result stating whether the text matches and how many occurrences were found, confirming whether your pattern behaves the way you expect.
When to use Test Text with a RegExp
Test Text with a RegExp checks whether a piece of text matches a regular expression and reports how many times it does. Use Test Text with a RegExp to quickly verify a pattern's behavior before wiring it into real validation code.
- Debugging a validation regex before shipping it. You wrote a regex meant to validate usernames, and testing it against several sample inputs confirms it accepts valid ones and rejects invalid ones as expected.
- Checking if a string contains a required value. You need a quick yes-or-no answer for whether a pasted string contains a certain code or keyword, without writing a script to check it.
- Counting occurrences of a pattern in a passage. You want to know how many times a specific word or number pattern appears in a paragraph, and this reports the count directly.
Examples
Does it contain a number?
Input
item 7
Output
Yes — the text matches (1 occurrence).
About the Test Text with a RegExp tool
Test Text with a RegExp runs as plain JavaScript in your browser tab, with no server behind it. Check whether the text matches a regular expression. Whatever you put in stays on your device from start to finish.
The tool is part of EditSafely's Text Tools section, 211 single-purpose utilities built around the same idea: open the page, get the result, keep your data to yourself.
You can shape the output with 2 settings, including Regular expression and Case sensitive, and the result refreshes the moment you change one. A worked example further down the page shows exactly what the tool produces for a real input.
That local-first design has practical benefits beyond privacy. The tool keeps working on a flaky connection once the page has loaded, results are instant because nothing round-trips to a server, and it is safe to use with confidential material.
Frequently asked questions
Does Test Text with a RegExp cost anything?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
No data leaves your device. The whole tool is JavaScript that runs inside your browser tab, so there is no upload, no server-side processing and no log of what you did. If you disconnect from the internet after the page loads, it keeps working.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
Nothing to install and no account needed. Open the page in any up-to-date browser, including on a phone or tablet, and the tool is ready.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.