验证字符串是否仅包含 javascript 中的某些字符

Question

I know this question has been asked here many times, but mine is a tad different. I do not want to validate if the string is alphanumeric, I just need it to only consist of a few characters, let's say letters: A, B, a, b and this symbol >. Is it possible with regex?

Answer 1

A simple example:

var isValidString = stringToValidate.match(/^[AaBb>]*$/) !== null;

Explanation:

String.prototype.match() can be called on any string and it will return an array, if the regex matched (containing the matched substrings) or null.

Wrapping the regular expression between caret ( ^ ) and dollar ( $ ) signs will ensure, that you check the string in full length.

You can add any characters between square brackets as you like, it will only match those.

Answer 2

Yes, you could do something like this.

/(?![ABC])./g

This will match anything that ISNT A, B or C. Meaning that if it gets a match, your validation should fail.