support for international parameter names (regex categories); fix #601

Dapper.Tests/Tests.Parameters.cs

@@ -1043,5 +1043,22 @@ static void Incr(ref int i)
             else if (i <= 1000) i += 50;
             else i += 100;
         }
+
+        [Fact]
+        public void Issue601_InternationalParameterNamesWork()
+        {
+            // regular parameter
+            var result = connection.QuerySingle<int>("select @æøå٦", new { æøå٦ = 42 });
+            result.IsEqualTo(42);
+
+#if OLEDB
+            // pseudo-positional
+            using (var connection = ConnectViaOledb())
+            {
+                int value = connection.QuerySingle<int>("select ?æøå٦?", new { æøå٦ = 42 });
+            }
+#endif
+        }
+
     }
 }

Dapper/SqlMapper.cs

@@ -2097,13 +2097,13 @@ public static object SanitizeParameterValue(object value)
         }
         private static IEnumerable<PropertyInfo> FilterParameters(IEnumerable<PropertyInfo> parameters, string sql)
         {
-            return parameters.Where(p => Regex.IsMatch(sql, @"[?@:]" + p.Name + "([^a-z0-9_]+|$)", RegexOptions.IgnoreCase | RegexOptions.Multiline | RegexOptions.CultureInvariant));
+            return parameters.Where(p => Regex.IsMatch(sql, @"[?@:]" + p.Name + @"([^\p{L}\p{N}_]+|$)", RegexOptions.IgnoreCase | RegexOptions.Multiline | RegexOptions.CultureInvariant));
         }
 
         // look for ? / @ / : *by itself*
-        static readonly Regex smellsLikeOleDb = new Regex(@"(?<![a-z0-9@_])[?@:](?![a-z0-9@_])", RegexOptions.IgnoreCase | RegexOptions.Multiline | RegexOptions.CultureInvariant | RegexOptions.Compiled),
-            literalTokens = new Regex(@"(?<![a-z0-9_])\{=([a-z0-9_]+)\}", RegexOptions.IgnoreCase | RegexOptions.Multiline | RegexOptions.CultureInvariant | RegexOptions.Compiled),
-            pseudoPositional = new Regex(@"\?([a-z_][a-z0-9_]*)\?", RegexOptions.IgnoreCase | RegexOptions.CultureInvariant | RegexOptions.Compiled);
+        static readonly Regex smellsLikeOleDb = new Regex(@"(?<![\p{L}\p{N}@_])[?@:](?![\p{L}\p{N}@_])", RegexOptions.IgnoreCase | RegexOptions.Multiline | RegexOptions.CultureInvariant | RegexOptions.Compiled),
+            literalTokens = new Regex(@"(?<![\p{L}\p{N}_])\{=([\p{L}\p{N}_]+)\}", RegexOptions.IgnoreCase | RegexOptions.Multiline | RegexOptions.CultureInvariant | RegexOptions.Compiled),
+            pseudoPositional = new Regex(@"\?([\p{L}_][\p{L}\p{N}_]*)\?", RegexOptions.IgnoreCase | RegexOptions.CultureInvariant | RegexOptions.Compiled);