Use MemoryExtensions.IndexOfAny in WildcardPattern (PowerShell#18242)

Author: xtqqczze

src/System.Management.Automation/engine/regex.cs

@@ -57,12 +57,12 @@ public sealed class WildcardPattern
         // The size is less than MaxShortPath = 260.
         private const int StackAllocThreshold = 256;
 
+        // chars that are considered special in a wildcard pattern
+        private const string SpecialChars = "*?[]`";
+
         // we convert a wildcard pattern to a predicate
         private Predicate<string> _isMatch;
 
-        // chars that are considered special in a wildcard pattern
-        private static readonly char[] s_specialChars = new[] { '*', '?', '[', ']', '`' };
-
         // static match-all delegate that is shared by all WildcardPattern instances
         private static readonly Predicate<string> s_matchAll = _ => true;
 
@@ -173,8 +173,8 @@ StringComparison GetStringComparison()
                 return;
             }
 
-            int index = Pattern.IndexOfAny(s_specialChars);
-            if (index == -1)
+            int index = Pattern.AsSpan().IndexOfAny(SpecialChars);
+            if (index < 0)
             {
                 // No special characters present in the pattern, so we can just do a string comparison.
                 _isMatch = str => string.Equals(str, Pattern, GetStringComparison());