javascript - Check for multiple words

Question

I have one problem with this code when I add more than one word to the titleIs Var it does not fire the if statement. The top one does not work ie if a word is in Var titleIs and is in var words, fire the if statement.

Thank you for your help!

var titleIs = ['Knit', 'Main'];
var words = ['Woven', 'Main'];
var regex = new RegExp('^(' + words.join('|') + ')$');
if (regex.test(titleIs)) {
alert("true")
}

These two work:

var titleIs = ['Woven'];
var words = ['Woven', 'Main'];
var regex = new RegExp('^(' + words.join('|') + ')$');
if (regex.test(titleIs)) {
alert("true")
}

var titleIs = ['Main'];
var words = ['Woven', 'Main'];
var regex = new RegExp('^(' + words.join('|') + ')$');
if (regex.test(titleIs)) {
alert("true")
}

Answer 1

test method accepts a single string. (in fact when you send an array with only one element, it takes that element into account).

You need a new method called testAny to be defined like this:

RegExp.prototype.testAny = function (arr){
    for(var i=0; i<arr.length; i++){
        if (this.test(arr[i])) return true;
    }
    return false;
}

(in fact matchesAny is a better name - in my opinion - but used the above name to keep it consistent with the existing test method)

and then be used in your if instead.

if(regex.testAny(titleIs)) ...