JSFiddle - React, Tailwind, and code Playground
by Claudius
JavaScript
var fullUrl = "http://something.com/File/?URL=http://www.wireshock.com/&IP=0.0.0.0&CAT=BLOG&USER=MAND\\DEFAULT\\market4080";
var extractUrl = fullUrl.replace(/.*URL=([^&]*)\&.*/,'$1');
alert(extractUrl);