# System.Buffers.Text

``` diff
 namespace System.Buffers.Text {
     public static class Base64 {
+        public static bool IsValid(ReadOnlySpan<byte> base64TextUtf8);
+        public static bool IsValid(ReadOnlySpan<byte> base64TextUtf8, out int decodedLength);
+        public static bool IsValid(ReadOnlySpan<char> base64Text);
+        public static bool IsValid(ReadOnlySpan<char> base64Text, out int decodedLength);
     }
 }
```

