1var format = /[!@#$%^&*()_+\-=\[\]{};':"\\|,.<>\/?]+/;
2
3if(format.test(string)){
4  return true;
5} else {
6  return false;
7}

1var format = /[ `!@#$%^&*()_+\-=\[\]{};':"\\|,.<>\/?~]/;
2//            ^                                       ^   
3document.write(format.test("My@string-with(some%text)") + "<br/>");    //true
4document.write(format.test("My string with spaces") + "<br/>");        //true 
5document.write(format.test("MyStringContainingNoSpecialChars"));       //false

1var email = "grepper@gmail.com";
2if(email.includes("@")){
3  console.log("Email is valid");
4}
5else{
6  console.log("Email is not valid");
7}
8// includes return boolean, if your string found => true else => false

1var format = /[ `!@#$%^&*()_+\-=\[\]{};':"\\|,.<>\/?~]/;
2//            ^                                       ^   
3document.write(format.test("My@string-with(some%text)") + "<br/>");
4document.write(format.test("My string with spaces") + "<br/>");
5document.write(format.test("MyStringContainingNoSpecialChars"));