Generate Text from a RegExp
Create random strings that match 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 Generate Text from a RegExp
- 1. Paste your regular expression. Paste a regular expression pattern into the input pane, such as one describing a phone number, product code or ID format you want sample values for.
- 2. Set how many samples to generate. Enter a number in How many to generate to control how many distinct random strings matching your pattern come back in the output.
- 3. Copy the generated matches. Copy the list of generated strings from the output pane and paste them into test fixtures, sample data or anywhere realistic-looking matches are useful.
When to use Generate Text from a RegExp
Generate Text from a RegExp creates random strings that match a regular expression you supply, effectively running the pattern in reverse. It's built for whenever you need sample data that conforms to a specific format rather than typing it by hand.
- Generating test fixtures for a validation pattern. You wrote a regex to validate order IDs and want a handful of valid sample values to drop into unit tests without manually crafting each one.
- Producing fake phone numbers for a demo. A product demo needs realistic-looking phone numbers or codes that match a specific format, and generating several from a pattern beats making them up by hand.
- Populating a database with pattern-conforming sample rows. Seeding a development database needs values that match a strict format like an invoice number pattern, and generating a batch from the regex saves writing a script.
Examples
Fake phone numbers
Input
\d{3}-\d{4}Output
482-1907 130-5568 … (randomized each run)
About the Generate Text from a RegExp tool
Generate Text from a RegExp does its work locally, right in the browser. Create random strings that match a regular expression. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the Text Tools collection on EditSafely, a set of 211 small, focused Text utilities that share the same instant, private workspace.
You can shape the output with the How many to generate setting, and the result refreshes the moment you change it. A worked example further down the page shows exactly what the tool produces for a real input.
Running locally also makes the tool fast and dependable: results appear as you type or drop a file, there is no server outage that can take it down mid-task, and confidential data can be processed without a second thought.
Frequently asked questions
Is Generate Text from a RegExp free to use?
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?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
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?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
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.