release-notes/7.0/preview/api-diff/preview7/Microsoft.NETCore.App/7.0-preview7_System.Text.RegularExpressions.md


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# System.Text.RegularExpressions

``` diff
 namespace System.Text.RegularExpressions {
     [NullableAttribute((byte)0)]
     [NullableContextAttribute((byte)1)]
     public class Regex : ISerializable {
+        [NullableContextAttribute((byte)0)]
+        public int Count(ReadOnlySpan<char> input, int startat);
+        [NullableContextAttribute((byte)0)]
+        public Regex.ValueMatchEnumerator EnumerateMatches(ReadOnlySpan<char> input, int startat);
+        [NullableContextAttribute((byte)0)]
+        public bool IsMatch(ReadOnlySpan<char> input, int startat);
     }
 }
```