JavaScript RegExp [^0-9] Character Class

What Is [^0-9]?

[^0-9] is a negated character class. It matches exactly one character that is not an ASCII digit 0–9. The ^ must be the first character inside the brackets to mean “not.”

/[^0-9]/     → one non-digit (letter, space, symbol, …)
/[0-9]/      → one digit (the opposite class)
/[^0-9]+/    → one or more non-digits
/\D/         → same idea as [^0-9] (shorthand)

"A1!".match(/[^0-9]/g)  → ["A", "!"]

^ inside []  → negate the class
^ outside [] → start-of-string anchor

How to Use [^0-9]

Write the class in a regex, then use test, match, or replace.

1. Write /[^0-9]/ (add g to find every match).
2. Use test() to check if any non-digit exists.
3. Use match() to collect non-digit characters.
4. Use replace(/[^0-9]/g, "") to strip non-digits and keep numbers.

Pseudocode

pattern = [^0-9]     // "not digit 0–9"

for each character c in text:
    if c is NOT in {0,1,2,3,4,5,6,7,8,9}:
        c matches
    else:
        c does not match

// with + : match the longest run of such characters

Cheat Sheet

Keep these facts handy while writing digit / non-digit patterns.

Live Preview

Pick a sample string and see every match of /[^0-9]/g.

text = "A1b2!"
text.match(/[^0-9]/g)
→ ["A", "b", "!"]

/* digits skipped; non-digits listed */

JavaScript Examples

Short, copy-ready snippets. Open DevTools Console, or use Try It Yourself for a live editor.

const nonDigit = /[^0-9]/;

console.log(nonDigit.test("12345"));  // false
console.log(nonDigit.test("12a45"));  // true
console.log(nonDigit.test("hello"));  // true

false
true
true

const text = "A1b2!";

console.log(text.match(/[^0-9]/g));   // ["A", "b", "!"]
console.log(text.match(/[^0-9]+/g));  // ["A", "b", "!"]
console.log("123".match(/[^0-9]/g)); // null

A,b,!
A,b,!
null

const phone = "(555) 123-4567";

console.log(phone.replace(/[^0-9]/g, ""));  // "5551234567"
console.log(phone.replace(/\D/g, ""));      // "5551234567"
console.log(/[^0-9]/.source);               // "[^0-9]"

5551234567
5551234567
[^0-9]

Performance Notes

Character-class matching is linear in string length for these patterns. Prefer test when you only need a yes/no answer.

Key Takeaways