JSFiddle - React, Tailwind, and code Playground

JavaScript

var string = prompt("write something here","hello");


if(string.search(regex_escape("+")) != -1){alert("special character")}
if(string.search(regex_escape("(")) != -1){alert("special character")}
if(string.search(regex_escape(")")) != -1){alert("special character")}
if(string.search(regex_escape("[")) != -1){alert("special character")}
if(string.search(regex_escape("]")) != -1){alert("special character")}
if(string.search(regex_escape("*")) != -1){alert("special character")}
if(string.search(regex_escape("\\")) != -1){alert("special character")}


function regex_escape(str) {
    return str.replace(new RegExp('[.\\\\+*?\\[\\^\\]$(){}=!<>|:\\-]', 'g'), '\\$&');
}