JSFiddle - React, Tailwind, and code Playground

JavaScript

function escapeRegExp(string) {
    return string.replace(/([.*+?^=!:${}()|[]\/\])/g, "\\$1");
}
function myFunction() {
    var yourDynamicString = 'how';
    var searchOnstring = 'how Are you';
    var regex = '\\b';
    regex += escapeRegExp(yourDynamicString);
    regex += '\\b';
    alert(regex);
    var y = new RegExp(regex, 'i').test(searchOnstring);
    alert(y);
}
myFunction();