Verify text with changing data

If you know the message will always start the same with, "This is a test on " - you could just capture the first 18 characters using [aqString.SubString] and supply today's date using your own function to validate. Here's how to return today's date and add that date to the end of your aqString.SubString for validation (sorry for bad formatting - inline code feature isn't working):

function getCurrentDate() {
var currentDate = aqDateTime.Today();
var today = aqConvert.DateTimeToFormatStr(currentDate, "%m/%d/%Y"); //MM/DD/YYYY
return today;
}

function mainMessageHandler() {
// set variables
var page = Sys.Browser("*").Page("*");
var date = getCurrentDate();
var aString = "This is a test on 01/01/2023"; //get text from obj
var aSubString = aqString.SubString(aString, 0, 18); //This_is_a_test_on_
var Res = aqString.Find(aqString.ToLower(aString), aqString.ToLower(aSubString));

// find subString and add today's date
Log.Message("LOG: full string --> " + aString);
Log.Message("LOG: substring --> " + aSubString);

if (!equal(Res, -1)) {
Log.Message("| Great Success | - substring '" + aSubString + "' was found");
Log.Checkpoint(aSubString + date);
}
else {
Log.Warning("WARNING: " + aSubString + " no found in: " + aString);
}
}