function restoreURLs(fieldValue, modelValue)
        {
            const urlRegex = /\b(url\([^)]*\))/g;
            var splitFieldValue = fieldValue.split(urlRegex);
            if (splitFieldValue.length === 1)
                return fieldValue;
            var modelUrlRegex = new RegExp(urlRegex);
            for (var i = 1; i < splitFieldValue.length; i += 2) {
                var match = modelUrlRegex.exec(modelValue);
                if (match)
                    splitFieldValue[i] = match[0];
            }
            return splitFieldValue.join("");
        }
@param {string} fieldValue
@param {string} modelValue
@return {string}