I am working with a regex named 'pattern' that is intended to allow only numbers as input. However, I'm noticing that both pattern.test("a") and pattern.test("1") are unexpectedly returning true. Can anyone explain why this is happening?
const pattern = /^[a-zA-Z0-9]*$/;
if (!pattern.test(event.target.value)) {
event.target.value = event.target.value.replace(/[^a-zA-Z0-9]/g, "");
}
The regular expression /^[a-zA-Z0-9]*$/ is used to match characters from a-z, A-Z, and 0-9. This will match any alphanumeric character. Adding the * means it can appear any number of times, including zero times. This allows it to match an empty string as well.
If you want to only match numeric values and an empty string, you can use /^[0-9]*$/.
To match only numeric values without allowing an empty string, use /^[0-9]+$/.
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