System.DateTimeParse.MatchWord C# (CSharp) Méthode

        private static bool MatchWord(ref __DTString str, String target)
        {
            int length = target.Length;
            if (length > (str.Value.Length - str.Index)) {
                return false;
            }
            
            if (str.CompareInfo.Compare(str.Value, str.Index, length,
                                        target, 0, length, CompareOptions.IgnoreCase)!=0) {
                return (false);
            }

            int nextCharIndex = str.Index + target.Length;

            if (nextCharIndex < str.Value.Length) {
                char nextCh = str.Value[nextCharIndex];
                if (Char.IsLetter(nextCh)) {
                    return (false);
                }
            }
            str.Index = nextCharIndex;
            if (str.Index < str.len) {
                str.m_current = str.Value[str.Index];
            }

            return (true);
        }