javascript - Allow only digits and a specific word in jQuery

Question

I need to write regular expression (or a test using jQuery) that allows only digits and a specific word.

For example (the word "Hello" is allowd):

• 123Hello => valid
• hello => valid
• 123 => valid
• hello word => invalid
• he123llo => invalid
• he llo 123 => invalid

Thank you in advance

question from:https://stackoverflow.com/questions/65843241/allow-only-digits-and-a-specific-word-in-jquery

Answer 1

If I understand correctly, the following simple pattern should work for you:

^d*(?:hello)?d*$

You may use the regex in case insensitive mode. Example:

var inputs = ["123Hello", "hello", "123", "hello word", "he123llo", "he llo 123"];
inputs.forEach(function(input) {
    if (/^d*(?:hello)?d*$/i.test(input)) {
        console.log(input + ": VALID");
    }
    else {
        console.log(input + ": INVALID");
    }
});