I'm encountering an issue with Regex.test

When working with the following JavaScript code...

$.post(url, data, function (json) {
        var patt = new RegExp('/^\[{"dID":/');
        if (patt.test(json)) {

            //output json results formatted
} else {

        //error so output json string
            $('#diaryTable').replaceWith(json);    

        }
    }, 'json');

My JSON is supposed to be either a valid JSON that starts with

[{"dID":

or it will have the format

[{ followed by an ex.Message from try catch exception... }]

However, I encounter the error message JavaScript runtime error: Expected ']' in regular expression

I tested my RegEx /^[{"dID":/ on RegEx101.com with sample data and it worked correctly. Any suggestions or insights?

javascriptjsonregex

Answer №1

Big thanks to everyone who lent a hand... I admit my explanation of the problem might have been a bit unclear...

Managed to resolve the issue by verifying the presence of a valid object... if there is a dID value, then it's considered valid...

 if (typeof json[0].dID !== 'undefined') {
            // valid object
            var result = "";
            var index;
            var flag = "N"

            for (index = 0; index < json.length; index++) {

                result += '<div class="dOuter' + flag + '">';
                result += '<div class="dInner">' + json[index].dDate + '</div>';
                result += '<div class="dInner">' + json[index].dRef + '</div>';
                result += '<div class="dInner">' + json[index].dTeam + '</div>';
                result += '<div class="dInner">' + json[index].dCreatedBy + '</div>';
                result += '<div class="dType ' + json[index].dType + '">' + json[index].dType + '</div>';
                result += '<div class="dServer">' + json[index].dServer + '</div>';
                result += '<div class="dComment">' + htmlEncode(json[index].dComment) + '</div></div>';

                if (flag == "N") {
                    flag = "A";
                } else {
                    flag = "N";
                }
            }

            $('#diaryTable').replaceWith(result);
        }

        else { 
            //error encountered, display json string
            $('#diaryTable').replaceWith(json);    
        }

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