System.Data.ProviderBase.SqlParamsRegex.Match C# (CSharp) Method

		protected internal override SimpleMatch Match(string input, int beginning, int length) {

			int actualLen = length-1; //there must be something after @
			for (int i = beginning; i < actualLen; i++) {
				char ch = input[i];
				switch(ch) {
					case '\'': {
						int end = input.IndexOf('\'', i+1);
						if (end < 0)
							break;

						i = end;
						break;
					}
					case '"': {
						int end = input.IndexOf('"', i+1);
						if (end < 0)
							break;

						i = end;
						break;
					}
					case '[': {
						int end = input.IndexOf(']', i+1);
						if (end < 0)
							break;

						i = end;
						break;
					}
					case '@': {
						int start = i;

						do {
							i++;
						}while (i < length && input[i] == '@');

						if (i - start > 1)
							break;

						while (i < length && IsWordChar(input[i]))
							i++;
	
						return new SimpleMatch(this, length, true, start, i-start, input);
					}
				}
			}

			return new SimpleMatch(this, length, false, length, 0, input);
		}
	}