System.Xml.Schema.FacetsChecker.FacetsCompiler.Preprocess C# (CSharp) Méthode

        private static string Preprocess(string pattern) {
            StringBuilder bufBld = new StringBuilder();
            bufBld.Append("^");

            char[] source = pattern.ToCharArray();
            int length = pattern.Length;
            int copyPosition = 0;
            for (int position = 0; position < length - 2; position ++) {
                if (source[position] == '\\') {
                    if (source[position + 1] == '\\') {
                        position ++; // skip it
                    }
                    else {
                        char ch = source[position + 1];
                        for (int i = 0; i < c_map.Length; i++) {
                            if (c_map[i].match == ch) {
                                if (copyPosition < position) {
                                    bufBld.Append(source, copyPosition, position - copyPosition);
                                }
                                bufBld.Append(c_map[i].replacement);
                                position ++;
                                copyPosition = position + 1;
                                break;
                            }
                        }
                    }
                }
            }
            if (copyPosition < length) {
                bufBld.Append(source, copyPosition, length - copyPosition);
            }

            bufBld.Append("$");
            return bufBld.ToString();
        }