Sample code for js special character filtering

//Matches the Chinese alphanumeric underscore & NBSP;          
 var checkInput = function (str) {
            var pattern =var pattern = /^[wu4e00-u9fa5]+$/gi;
            if(pattern.test(c))
            {
                return false;
            }
            return true;
        }

1. Js USES regular expressions to filter special characters and verify whether all input fields contain special symbols

function stripscript(s) {
    var pattern = new RegExp("[`~!@#$^&*()=|{}':;',\[\].<>/?~ ! @# RMB... &* (a) — - |{} 【 】 '; : "" ' . ,,? ]")
        var rs = "";
    for (var i = 0; i < s.length; i++) {
        rs = rs + s.substr(i, 1).replace(pattern, '');
    }
    return rs;
}

2. Verify that all input fields contain special symbols

function checkAllTextValid(form) {
    //Records the number of text boxes without quotes
    var resultTag = 0;
    //Records the number of all text boxes
    var flag = 0;
    for (var i = 0; i < form.elements.length; i++) {
        if (form.elements[i].type == "text") {
            flag = flag + 1;
            //Fill in the special symbol to be filtered here
            //Note: modify the character at ####. Do not modify other parts.
            //if(/^[^####]*$/.test(form.elements[i].value))

            if (/^[^|"'<>]*$/.test(form.elements[i].value))
                resultTag = resultTag + 1;
            else
                form.elements[i].select();
        }
    }

    
    if (resultTag == flag)
        return true;
    else {
        alert(" Text box cannot contain nn 1  Single quotes : ' n 2  Double quotation marks : " n 3  vertical   bar : | n 4  Sharp corners, : < > nn Please check the input! ");
        return false;
    }
}