dotnet-core/release-notes/3.0/api-diff/3.0.0_System.Text.RegularExpressions.md

System.Text.RegularExpressions

 namespace System.Text.RegularExpressions {
-    public class GroupCollection : ICollection, ICollection<Group>, IEnumerable, IEnumerable<Group>, IList, IList<Group>, IReadOnlyCollection<Group>, IReadOnlyList<Group> {
+    public class GroupCollection : ICollection, ICollection<Group>, IEnumerable, IEnumerable<Group>, IEnumerable<KeyValuePair<string, Group>>, IList, IList<Group>, IReadOnlyCollection<Group>, IReadOnlyCollection<KeyValuePair<string, Group>>, IReadOnlyDictionary<string, Group>, IReadOnlyList<Group> {
+        public IEnumerable<string> Keys { get; }
+        public IEnumerable<Group> Values { get; }
+        public bool ContainsKey(string key);
+        IEnumerator<KeyValuePair<string, Group>> System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<System.String,System.Text.RegularExpressions.Group>>.GetEnumerator();
+        public bool TryGetValue(string key, out Group value);
     }
 }