JSFiddle - React, Tailwind, and code Playground

HTML

<input id="one" value="@techreport{blabl,  
   blabla = {},  
   url = {http://server.com/thepdf.pdf},  
   wrongurl ={http://server.com/thepdf2.pdf}, 
   blablabla = 1998,  
   blablablabla= {blablablablabla}}">

<hr />
<input type="button" id="click" value="click me">

JavaScript

$(document).ready(function() {

    $('#click').click(function(){

     var one = document.getElementById('one');       
        one.value.match(/url ={([^}]*)}/,"");
        alert( RegExp.$1);

          
    })    
})