Question

I am taking a textbox value as a file name to store a file and that input comes from the end users. So I need validate that "\/:*?"<>|" these characters are not present in the input value since file name can not contain those special character. How I can do this using javascript?

Answer 1

// val - is your value
if (/[\/:*?"<>|]/.test(val)) {
    alert('invalid!');
    // ... prevent form from being sent
}