YSOD Yellow Screen Of Death JavaScript RegExp - Syntax Error

Question

I built up this regex at http://regextester.com to parse YSOD but VS is complaining about a syntax error. I am sure I am missing an escape somewhere but I am coming up blank.

Here is is in original form. any help is appreciated.

var rxYSOD = /<!--\s*\[(.*?)]:(\s*.*\s(.*\n)*?)\s*(at(.*\n)*)-->/gs;

UPDATE: Kobi pointed out the obvious and got me moving again. For those who are interested, this is valid JavaScript to test and parse an XMLHttpRequest.responseText for an ASP.net Yellow Screen Of Death (YSOD).

var rxYSOD = /<!--\s*\[(.*?)]:(\s*.*\s(.*[\n\r]*)*?)\s*(at(.*[\n\r]*)*)-->/;
if (rxYSOD.test(text)) {
    // looks like one..
    var ysod = rxYSOD.exec(text);
    errObj = { Message: ysod[2], StackTrace: ysod[4], ExceptionType: ysod[1] };
}

@Kobi - This is the result and the reason I want to parse the html even though I get a 500:

{
 "message": " Unknown web method ValidateUser.\r\nParameter name: methodName\r\n",
 "stackTrace": "at System.Web.Script.Services.WebServiceData.GetMethodData(String methodName)\r\n   at System.Web.Script.Services.RestHandler.CreateHandler(WebServiceData webServiceData, String methodName)\r\n   at System.Web.Script.Services.RestHandler.CreateHandler(HttpContext context)\r\n   at System.Web.Script.Services.RestHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated)\r\n   at System.Web.Script.Services.ScriptHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated)\r\n   at System.Web.HttpApplication.MapHttpHandler(HttpContext context, String requestType, VirtualPath path, String pathTranslated, Boolean useAppConfig)\r\n   at System.Web.HttpApplication.MapHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()\r\n   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)\r\n",
 "exceptionType": "ArgumentException",
 "errorObject": {
  "Message": " Unknown web method ValidateUser.\r\nParameter name: methodName\r\n",
  "StackTrace": "at System.Web.Script.Services.WebServiceData.GetMethodData(String methodName)\r\n   at System.Web.Script.Services.RestHandler.CreateHandler(WebServiceData webServiceData, String methodName)\r\n   at System.Web.Script.Services.RestHandler.CreateHandler(HttpContext context)\r\n   at System.Web.Script.Services.RestHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated)\r\n   at System.Web.Script.Services.ScriptHandlerFactory.GetHandler(HttpContext context, String requestType, String url, String pathTranslated)\r\n   at System.Web.HttpApplication.MapHttpHandler(HttpContext context, String requestType, VirtualPath path, String pathTranslated, Boolean useAppConfig)\r\n   at System.Web.HttpApplication.MapHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()\r\n   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)\r\n",
  "ExceptionType": "ArgumentException"
 },
 "statusCode": 500,
 "servicePath": "/Authentication_JSON_AppService.axd",
 "useGet": false,
 "params": {
  "username": "testingUser",
  "password": "testingUser",
  "customCredential": null
 },
 "methodName": "ValidateUser",
 "__typeName": "Salient.ScriptModel.WebServiceError"
}

Won't you also get status code `500 Internal Server Error` for these screens? Anyway, good luck! — Kobi, Feb 28 '10 at 11:49
@Kobi, Yeah, sure do. thats why I am parsing the page out as it has the actual exception. Nothing I hate worse is a catch all exception message when the information is actually available. — Sky Sanders, Feb 28 '10 at 11:57

Kobi · Accepted Answer · 2010-02-28T11:33:31.533

4

Firefox says:

Error: invalid regular expression flag s
Source Code:
var rxYSOD = /<!--\s*\[(.*?)]:(\s*.*\s(.*\n)*?)\s*(at(.*\n)*)-->/gs;

After removing the s it seems ok (of course, it isn't tested, just parsed correctly).

edited Feb 28 '10 at 11:33

answered Feb 28 '10 at 11:25

Kobi

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thanks. this is one of those late nights where my grasp of the obvious leaked out my ear at around midnight. – Sky Sanders Feb 28 '10 at 11:30
r.e. CTRL+SHFT+J - yea, i use it quite a bunch. I work on a lot of javascript intellisense code... – Sky Sanders Feb 28 '10 at 11:31
oops, showing my ignorance again - now I realize you are talking about FF err console. Thanks. – Sky Sanders Feb 28 '10 at 11:41
No problem, happy to help. Now, take a short break. It's on me :) – Kobi Feb 28 '10 at 11:45

score 2 · Answer 2 · answered Feb 28 '10 at 11:27

2

The flag s is invalid in Javascript. To replace, use the replace method.

answered Feb 28 '10 at 11:27

Mark Byers

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thanks, mark. you are right, but not trying to replace, just match. Kobi nailed it too. – Sky Sanders Feb 28 '10 at 11:32

YSOD Yellow Screen Of Death JavaScript RegExp - Syntax Error

2 Answers2