redundant upper/lower case in regex

Dapper NET40/SqlMapper.cs

@@ -2735,7 +2735,7 @@ private static IEnumerable<PropertyInfo> FilterParameters(IEnumerable<PropertyIn
         }
 
         // look for ? / @ / : *by itself*
-        static readonly Regex smellsLikeOleDb = new Regex(@"(?<![a-z0-9@_])[?@:](?![a-zA-Z0-9@_])", RegexOptions.IgnoreCase | RegexOptions.Multiline | RegexOptions.CultureInvariant | RegexOptions.Compiled),
+        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);