fix remark about empty array

Author: gewarren

snippets/csharp/System/String/IndexOfAny/IndexOfAny1.cs

@@ -1,19 +1,19 @@
-// <Snippet1>
-using System;
+using System;
 
 public class Example
 {
    public static void Main()
    {
-      char[] chars = { 'a', 'e', 'i', 'o', 'u', 'y', 
+      // <Snippet1>
+      char[] chars = { 'a', 'e', 'i', 'o', 'u', 'y',
                        'A', 'E', 'I', 'O', 'U', 'Y' };
       String s = "The long and winding road...";
-      Console.WriteLine("The first vowel in \n   {0}\nis found at position {1}", 
-                        s, s.IndexOfAny(chars) + 1);                         
+      Console.WriteLine($"The first vowel in \n   {s}\nis found at index {s.IndexOfAny(chars)}");
+
+      // The example displays the following output:
+      //       The first vowel in
+      //          The long and winding road...
+      //       is found at index 2
+      // </Snippet1>
    }
 }
-// The example displays the following output:
-//       The first vowel in
-//          The long and winding road...
-//       is found at position 3
-// </Snippet1>

snippets/fsharp/System/String/IndexOfAny/IndexOfAny1.fs

@@ -3,9 +3,10 @@ module IndexOfAny1.fs
 let chars = [| 'a'; 'e'; 'i'; 'o'; 'u'; 'y'
                'A'; 'E'; 'I'; 'O'; 'U'; 'Y' |]
 let s = "The long and winding road..."
-printfn $"The first vowel in \n   {s}\nis found at position {s.IndexOfAny chars + 1}"
+printfn $"The first vowel in \n   {s}\nis found at position {s.IndexOfAny chars}"
+
 // The example displays the following output:
 //       The first vowel in
 //          The long and winding road...
-//       is found at position 3
+//       is found at index 2
 // </Snippet1>

snippets/visualbasic/System/String/IndexOfAny/IndexOfAny1.vb

@@ -4,15 +4,16 @@ Option Strict On
 ' <Snippet1>
 Module Example
    Public Sub Main()
-      Dim chars() As Char = { "a"c, "e"c, "i"c, "o"c, "u"c, "y"c, 
+      Dim chars() As Char = { "a"c, "e"c, "i"c, "o"c, "u"c, "y"c,
                               "A"c, "E"c, "I"c, "O"c, "U"c, "Y"c }
       Dim s As String = "The long and winding road..."
-      Console.WriteLine("The first vowel in {2}   {0}{2}is found at position {1}", 
-                        s, s.IndexOfAny(chars) + 1, vbCrLf)                         
+      Console.WriteLine("The first vowel in {2}   {0}{2}is found at index {1}",
+                        s, s.IndexOfAny(chars), vbCrLf)
    End Sub
 End Module
+
 ' The example displays the following output:
 '       The first vowel in
 '          The long and winding road...
-'       is found at position 3
+'       is found at index 2
 ' </Snippet1>

xml/System/String.xml

@@ -7846,13 +7846,15 @@ In the following example, the <see cref="M:System.String.IndexOf(System.String,S
           <format type="text/markdown"><![CDATA[
 
 ## Remarks
+
 Index numbering starts from zero.
 
-The search for `anyOf` is case-sensitive. If `anyOf` is an empty array, the method finds a match at the beginning of the string (that  is, at index zero).
+The search for `anyOf` is case-sensitive. If `anyOf` is an empty array, the method returns -1.
 
 This method performs an ordinal (culture-insensitive) search, where a character is considered equivalent to another character only if their Unicode scalar values are the same. To perform a culture-sensitive search, use the <xref:System.Globalization.CompareInfo.IndexOf%2A?displayProperty=nameWithType> method, where a Unicode scalar value representing a precomposed character, such as the ligature "Æ" (U+00C6), might be considered equivalent to any occurrence of the character's components in the correct sequence, such as "AE" (U+0041, U+0045), depending on the culture.
 
 ## Examples
+
 The following example finds the first vowel in a string.
 
 :::code language="csharp" source="~/snippets/csharp/System/String/IndexOfAny/IndexOfAny1.cs" interactive="try-dotnet" id="Snippet1":::