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    <p>When I ran into this on a contract, I had no other option than to have a 100% compliant TransactSQL LIKE function. Below is the result - a static function and a string extension method. I'm sure it can be optimized further, but it's pretty fast and passed my long list of test scenarios. Hope it helps someone!</p> <pre><code>using System; using System.Collections.Generic; namespace SqlLikeSample { public class TestSqlLikeFunction { static void Main(string[] args) { TestSqlLikePattern(true, "%", ""); TestSqlLikePattern(true, "%", " "); TestSqlLikePattern(true, "%", "asdfa asdf asdf"); TestSqlLikePattern(true, "%", "%"); TestSqlLikePattern(false, "_", ""); TestSqlLikePattern(true, "_", " "); TestSqlLikePattern(true, "_", "4"); TestSqlLikePattern(true, "_", "C"); TestSqlLikePattern(false, "_", "CX"); TestSqlLikePattern(false, "[ABCD]", ""); TestSqlLikePattern(true, "[ABCD]", "A"); TestSqlLikePattern(true, "[ABCD]", "b"); TestSqlLikePattern(false, "[ABCD]", "X"); TestSqlLikePattern(false, "[ABCD]", "AB"); TestSqlLikePattern(true, "[B-D]", "C"); TestSqlLikePattern(true, "[B-D]", "D"); TestSqlLikePattern(false, "[B-D]", "A"); TestSqlLikePattern(false, "[^B-D]", "C"); TestSqlLikePattern(false, "[^B-D]", "D"); TestSqlLikePattern(true, "[^B-D]", "A"); TestSqlLikePattern(true, "%TEST[ABCD]XXX", "lolTESTBXXX"); TestSqlLikePattern(false, "%TEST[ABCD]XXX", "lolTESTZXXX"); TestSqlLikePattern(false, "%TEST[^ABCD]XXX", "lolTESTBXXX"); TestSqlLikePattern(true, "%TEST[^ABCD]XXX", "lolTESTZXXX"); TestSqlLikePattern(true, "%TEST[B-D]XXX", "lolTESTBXXX"); TestSqlLikePattern(true, "%TEST[^B-D]XXX", "lolTESTZXXX"); TestSqlLikePattern(true, "%Stuff.txt", "Stuff.txt"); TestSqlLikePattern(true, "%Stuff.txt", "MagicStuff.txt"); TestSqlLikePattern(false, "%Stuff.txt", "MagicStuff.txt.img"); TestSqlLikePattern(false, "%Stuff.txt", "Stuff.txt.img"); TestSqlLikePattern(false, "%Stuff.txt", "MagicStuff001.txt.img"); TestSqlLikePattern(true, "Stuff.txt%", "Stuff.txt"); TestSqlLikePattern(false, "Stuff.txt%", "MagicStuff.txt"); TestSqlLikePattern(false, "Stuff.txt%", "MagicStuff.txt.img"); TestSqlLikePattern(true, "Stuff.txt%", "Stuff.txt.img"); TestSqlLikePattern(false, "Stuff.txt%", "MagicStuff001.txt.img"); TestSqlLikePattern(true, "%Stuff.txt%", "Stuff.txt"); TestSqlLikePattern(true, "%Stuff.txt%", "MagicStuff.txt"); TestSqlLikePattern(true, "%Stuff.txt%", "MagicStuff.txt.img"); TestSqlLikePattern(true, "%Stuff.txt%", "Stuff.txt.img"); TestSqlLikePattern(false, "%Stuff.txt%", "MagicStuff001.txt.img"); TestSqlLikePattern(true, "%Stuff%.txt", "Stuff.txt"); TestSqlLikePattern(true, "%Stuff%.txt", "MagicStuff.txt"); TestSqlLikePattern(false, "%Stuff%.txt", "MagicStuff.txt.img"); TestSqlLikePattern(false, "%Stuff%.txt", "Stuff.txt.img"); TestSqlLikePattern(false, "%Stuff%.txt", "MagicStuff001.txt.img"); TestSqlLikePattern(true, "%Stuff%.txt", "MagicStuff001.txt"); TestSqlLikePattern(true, "Stuff%.txt%", "Stuff.txt"); TestSqlLikePattern(false, "Stuff%.txt%", "MagicStuff.txt"); TestSqlLikePattern(false, "Stuff%.txt%", "MagicStuff.txt.img"); TestSqlLikePattern(true, "Stuff%.txt%", "Stuff.txt.img"); TestSqlLikePattern(false, "Stuff%.txt%", "MagicStuff001.txt.img"); TestSqlLikePattern(false, "Stuff%.txt%", "MagicStuff001.txt"); TestSqlLikePattern(true, "%Stuff%.txt%", "Stuff.txt"); TestSqlLikePattern(true, "%Stuff%.txt%", "MagicStuff.txt"); TestSqlLikePattern(true, "%Stuff%.txt%", "MagicStuff.txt.img"); TestSqlLikePattern(true, "%Stuff%.txt%", "Stuff.txt.img"); TestSqlLikePattern(true, "%Stuff%.txt%", "MagicStuff001.txt.img"); TestSqlLikePattern(true, "%Stuff%.txt%", "MagicStuff001.txt"); TestSqlLikePattern(true, "_Stuff_.txt_", "1Stuff3.txt4"); TestSqlLikePattern(false, "_Stuff_.txt_", "1Stuff.txt4"); TestSqlLikePattern(false, "_Stuff_.txt_", "1Stuff3.txt"); TestSqlLikePattern(false, "_Stuff_.txt_", "Stuff3.txt4"); Console.ReadKey(); } public static void TestSqlLikePattern(bool expectedResult, string pattern, string testString) { bool result = testString.SqlLike(pattern); if (expectedResult != result) { Console.ForegroundColor = ConsoleColor.Red; System.Console.Out.Write("[SqlLike] FAIL"); } else { Console.ForegroundColor = ConsoleColor.Green; Console.Write("[SqlLike] PASS"); } Console.ForegroundColor = ConsoleColor.White; Console.WriteLine(": \"" + testString + "\" LIKE \"" + pattern + "\" == " + expectedResult); } } public static class SqlLikeStringExtensions { public static bool SqlLike(this string s, string pattern) { return SqlLikeStringUtilities.SqlLike(pattern, s); } } public static class SqlLikeStringUtilities { public static bool SqlLike(string pattern, string str) { bool isMatch = true, isWildCardOn = false, isCharWildCardOn = false, isCharSetOn = false, isNotCharSetOn = false, endOfPattern = false; int lastWildCard = -1; int patternIndex = 0; List&lt;char&gt; set = new List&lt;char&gt;(); char p = '\0'; for (int i = 0; i &lt; str.Length; i++) { char c = str[i]; endOfPattern = (patternIndex &gt;= pattern.Length); if (!endOfPattern) { p = pattern[patternIndex]; if (!isWildCardOn &amp;&amp; p == '%') { lastWildCard = patternIndex; isWildCardOn = true; while (patternIndex &lt; pattern.Length &amp;&amp; pattern[patternIndex] == '%') { patternIndex++; } if (patternIndex &gt;= pattern.Length) p = '\0'; else p = pattern[patternIndex]; } else if (p == '_') { isCharWildCardOn = true; patternIndex++; } else if (p == '[') { if (pattern[++patternIndex] == '^') { isNotCharSetOn = true; patternIndex++; } else isCharSetOn = true; set.Clear(); if (pattern[patternIndex + 1] == '-' &amp;&amp; pattern[patternIndex + 3] == ']') { char start = char.ToUpper(pattern[patternIndex]); patternIndex += 2; char end = char.ToUpper(pattern[patternIndex]); if (start &lt;= end) { for (char ci = start; ci &lt;= end; ci++) { set.Add(ci); } } patternIndex++; } while (patternIndex &lt; pattern.Length &amp;&amp; pattern[patternIndex] != ']') { set.Add(pattern[patternIndex]); patternIndex++; } patternIndex++; } } if (isWildCardOn) { if (char.ToUpper(c) == char.ToUpper(p)) { isWildCardOn = false; patternIndex++; } } else if (isCharWildCardOn) { isCharWildCardOn = false; } else if (isCharSetOn || isNotCharSetOn) { bool charMatch = (set.Contains(char.ToUpper(c))); if ((isNotCharSetOn &amp;&amp; charMatch) || (isCharSetOn &amp;&amp; !charMatch)) { if (lastWildCard &gt;= 0) patternIndex = lastWildCard; else { isMatch = false; break; } } isNotCharSetOn = isCharSetOn = false; } else { if (char.ToUpper(c) == char.ToUpper(p)) { patternIndex++; } else { if (lastWildCard &gt;= 0) patternIndex = lastWildCard; else { isMatch = false; break; } } } } endOfPattern = (patternIndex &gt;= pattern.Length); if (isMatch &amp;&amp; !endOfPattern) { bool isOnlyWildCards = true; for (int i = patternIndex; i &lt; pattern.Length; i++) { if (pattern[i] != '%') { isOnlyWildCards = false; break; } } if (isOnlyWildCards) endOfPattern = true; } return isMatch &amp;&amp; endOfPattern; } } } </code></pre>
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