Document exceptions that can be thrown from MatchGroupCollection.get(name)

libraries/stdlib/jdk8/src/kotlin/text/RegexExtensions.kt

@@ -23,7 +23,8 @@ package kotlin.text
  * Returns a named group with the specified [name].
  *
  * @return An instance of [MatchGroup] if the group with the specified [name] was matched or `null` otherwise.
- * @throws [UnsupportedOperationException] if getting named groups isn't supported on the current platform.
+ * @throws IllegalArgumentException if there is no group with the specified [name] defined in the regex pattern.
+ * @throws UnsupportedOperationException if getting named groups isn't supported on the current platform.
  */
 @SinceKotlin("1.2")
 public operator fun MatchGroupCollection.get(name: String): MatchGroup? {

libraries/stdlib/src/kotlin/text/regex/MatchResult.kt

@@ -35,6 +35,8 @@ public interface MatchNamedGroupCollection : MatchGroupCollection {
     /**
      * Returns a named group with the specified [name].
      * @return An instance of [MatchGroup] if the group with the specified [name] was matched or `null` otherwise.
+     * @throws IllegalArgumentException if there is no group with the specified [name] defined in the regex pattern.
+     * @throws UnsupportedOperationException if getting named groups isn't supported on the current platform.
      */
     public operator fun get(name: String): MatchGroup?
 }