How the pattern works
| Part | Meaning |
|---|---|
^[A-Za-z]+$ | One or more ASCII letters and nothing else |
Code examples
JavaScript
const re = /^[A-Za-z]+$/;
re.test(value); // true or falsePython
import re
bool(re.fullmatch(r'[A-Za-z]+', value))PHP
preg_match('/^[A-Za-z]+$/', $value) === 1;Notes and limitations
Accented and non-Latin letters (é, ñ, ü, Ж) are rejected. For letters in any language use ^\p{L}+$ with the u flag in JavaScript.
Regex TesterType a pattern and watch matches highlight live in your test text.
Open the tool Frequently asked questions
What is the regex for letters only?
/^[A-Za-z]+$/ — it matches the whole string. See the table above for what each part does.
Which examples match?
Of the examples tested, these match: Hello, abc, XYZ. 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.