[JS] Support named capture groups in Regex #KT-51775

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

@@ -24,7 +24,8 @@ package kotlin.text
  *
  * @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.
+ * @throws UnsupportedOperationException if this match group collection doesn't support getting match groups by name,
+ * for example, when it's not supported by the current platform.
  */
 @SinceKotlin("1.2")
 public operator fun MatchGroupCollection.get(name: String): MatchGroup? {