Just thought I share this useful function I’ve been using recently to enhance some of my applications to make text\/string searching more powerful.<\/p>\n
If you want to allow things like ‘and’, ‘or’ and ‘not’ in a text filter this could be useful to you. Additionally I also added keywords for things like ‘matchexactly’, ‘startswith’ and ‘endswith’.<\/p>\n
\r\npublic static class StringCompareUtils\r\n{\r\n public static bool ContainEx(string source, string findText, bool caseSensitive = false)\r\n {\r\n bool found = false;\r\n string lowerCasefindText = findText.ToLower();\r\n if (findText.Trim().Length == 0)\r\n {\r\n found = true;\r\n }\r\n else if (lowerCasefindText.Contains(" and "))\r\n {\r\n string[] parts = findText.Split(new string[] { " and ", " AND " }, StringSplitOptions.RemoveEmptyEntries);\r\n found = true;\r\n foreach (string part in parts)\r\n {\r\n if (!ContainEx(source, part))\r\n {\r\n found = false;\r\n break;\r\n }\r\n }\r\n }\r\n else if (lowerCasefindText.Contains(" or "))\r\n {\r\n string[] parts = findText.Split(new string[] { " or ", " OR " }, StringSplitOptions.RemoveEmptyEntries);\r\n foreach (string part in parts)\r\n {\r\n if (ContainEx(source, part))\r\n {\r\n found = true;\r\n break;\r\n }\r\n }\r\n }\r\n else\r\n {\r\n if (lowerCasefindText.TrimStart().StartsWith("not "))\r\n {\r\n found = !source.ContainEx2(findText.TrimStart().Substring(4), caseSensitive);\r\n }\r\n else\r\n found = source.ContainEx2(findText, caseSensitive);\r\n }\r\n return found;\r\n }\r\n private static bool ContainEx2(this string text, string findText, bool caseSensitive = false)\r\n {\r\n string matchText = caseSensitive ? text : text.ToLower();\r\n string matchFindText = caseSensitive ? findText : findText.ToLower();\r\n if (matchFindText.ToLower().StartsWith("matchexactly "))\r\n {\r\n return text == findText.Substring("matchexactly ".Length);\r\n }\r\n else if (findText.ToLower().StartsWith("startswith "))\r\n {\r\n return text.StartsWith(findText.Substring("startswith ".Length));\r\n }\r\n else if (findText.ToLower().StartsWith("endswith "))\r\n {\r\n return text.EndsWith(findText.Substring("endswith ".Length));\r\n }\r\n else\r\n {\r\n return text.Contains(findText);\r\n }\r\n }\r\n}\r\n<\/pre>\nThe default behavior is like the ‘like’ operator (text contains search filter). This allow you to find a string like ‘are’ in ‘You are welcome’. Using this function you can specify a filter like ‘startswith You’ or ‘endswith welcome’.<\/p>\n","protected":false},"excerpt":{"rendered":"
Just thought I share this useful function I’ve been using recently to enhance some of my applications to make text\/string searching more powerful. If you want to allow things like ‘and’, ‘or’ and ‘not’ in a text filter this could …<\/p>\n