Cómo verificar si hay charaters especiales con espacios JavaScript

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