Generate Regex From Integers
Build one regular expression that matches your integers. 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 Regex From Integers
- 1. Paste your integers. Enter the specific whole numbers you want a regular expression to match, one per line or separated by another consistent character.
- 2. Read the generated pattern. The tool builds a single regular expression using alternation and word boundaries that matches exactly the integers you provided and nothing else.
- 3. Copy the regex. Copy the generated pattern and drop it into your validation code, search-and-replace tool or configuration file wherever a matching expression is needed.
When to use Generate Regex From Integers
Generate Regex From Integers takes a specific list of whole numbers and writes a single regular expression that matches exactly those values. It saves the tedium of hand-assembling an alternation pattern with correct word boundaries and escaping.
- Building a validation rule from allowed codes. A form should only accept a fixed set of numeric status codes. Paste the allowed values here and drop the resulting regex straight into your validation logic.
- Matching specific IDs in a search-and-replace. You need to find every occurrence of a handful of specific record IDs in a large log file. Generate one combined pattern instead of running separate searches.
- Writing a linter rule for banned numbers. A codebase has a few magic numbers that should be flagged if they appear in new code. Generate a regex matching those specific integers for the linter's rule config.
- Documenting an accepted-values list. An API's documentation lists a handful of valid integer parameter values, and you want a matching regex to include alongside the prose description.
Examples
Alternation of two integers
Input
12 34
Output
\b(?:12|34)\b
A single integer
Input
7
Output
\b(?:7)\b
About the Generate Regex From Integers tool
Generate Regex From Integers does its work locally, right in the browser. Build one regular expression that matches your integers. There is no upload step, no queue and no account, and your data never travels over the network.
It belongs to the Integer Tools collection on EditSafely, a set of 133 small, focused Integer utilities that share the same instant, private workspace.
There is nothing to configure. Provide the input and the result appears on its own. 2 worked examples further down the page show exactly what the tool produces for real inputs.
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 Regex From Integers 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.
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