JSFiddle - React, Tailwind, and code Playground
JavaScript
var url = "http://www.mysite.com?foo=bar¶mNamePrefixXXX=value&fizz=buzz",
prefix = "paramNamePrefix";
var desiredValue = url.match(new RegExp('[?&]' + prefix + '.*?=(.*?)[&#$]', ''));
desiredValue = desiredValue && desiredValue[1];
console.log(desiredValue); // -> "value"