JSFiddle - React, Tailwind, and code Playground

HTML

<div id="valid"> 

r</div>

JavaScript

function validateDatabaseUrl() {
  
    var regexp = /^^jdbc:((postgresql)|(mysql)):\/\/[a-zA-Z0-9.-]+:[0-9]{2,4}\/[a-zA-Z0-9_]+$/;
    var url = "jdbc:mysql://128.123.44.14:8080/database_name";
    var error = "";
 
    if (!regexp.test(url)) {
        error = "Not a valid Database URL";
    } else {
        error = "Valid Database URL";
    }
    return error;

}
$(function(){ $("#valid").html(validateDatabaseUrl());
            })