Provide access to named groups of regex match result on JDK8.

#KT-12753 Fixed

libraries/stdlib/src/kotlin/internal/PlatformImplementations.kt

@@ -2,6 +2,7 @@
 package kotlin.internal
 
 import java.io.Closeable
+import java.util.regex.MatchResult
 
 internal open class PlatformImplementations {
 
@@ -16,6 +17,10 @@ internal open class PlatformImplementations {
         }
     }
 
+    public open fun getMatchResultNamedGroup(matchResult: MatchResult, name: String): MatchGroup? {
+        throw UnsupportedOperationException("Retrieving groups by name is not supported on this platform.")
+    }
+
     companion object {
         @JvmField
         @InlineExposed
@@ -52,5 +57,7 @@ internal open class PlatformImplementations {
         }
 
     }
+
+
 }