How the pattern works
| Part | Meaning |
|---|---|
^ | Start of the string |
\d+ | One or more digits 0–9 |
$ | End of the string |
Code examples
JavaScript
const re = /^\d+$/;
re.test(value); // true or falsePython
import re
bool(re.fullmatch(r'\d+', value))PHP
preg_match('/^\d+$/', $value) === 1;Notes and limitations
Use ^\d*$ to also allow an empty string. In JavaScript, \d only matches ASCII digits; in Python 3 it also matches other scripts’ digits (like ٣) unless you pass re.ASCII.
Regex TesterType a pattern and watch matches highlight live in your test text.
Open the tool Frequently asked questions
What is the regex for digits only?
/^\d+$/ — it matches the whole string. See the table above for what each part does.
Which examples match?
Of the examples tested, these match: 0, 123456, 007. The others don’t.
How do I test this regex?
Click “Open in Regex Tester” — the pattern, flags and sample text load automatically, and matches highlight as you edit.