System.DateTimeParse.TryParseQuoteString C# (CSharp) Method

        internal static bool TryParseQuoteString(String format, int pos, StringBuilder result, out int returnValue) {
            //
            // NOTE : pos will be the index of the quote character in the 'format' string.
            //
            returnValue = 0;
            int formatLen = format.Length;
            int beginPos = pos;
            char quoteChar = format[pos++]; // Get the character used to quote the following string.

            bool foundQuote = false;
            while (pos < formatLen) {
                char ch = format[pos++];
                if (ch == quoteChar) {
                    foundQuote = true;
                    break;
                }
                else if (ch == '\\') {
                    // The following are used to support escaped character.
                    // Escaped character is also supported in the quoted string.
                    // Therefore, someone can use a format like "'minute:' mm\"" to display:
                    //  minute: 45"
                    // because the second double quote is escaped.
                    if (pos < formatLen) {
                        result.Append(format[pos++]);
                    } else {
                        //
                        // This means that '\' is at the end of the formatting string.
                        //
                        return false;
                    }
                } else {
                    result.Append(ch);
                }
            }

            if (!foundQuote) {
                // Here we can't find the matching quote.
                return false;
            }

            //
            // Return the character count including the begin/end quote characters and enclosed string.
            //
            returnValue = (pos - beginPos);
            return true;
        }