class StackTraceExpander {

  @VisibleForTesting
  @Nullable
  static String getStackLine(@NotNull String line) {
    Matcher matcher = EXCEPTION_LINE_PATTERN.matcher(line);
    return matcher.matches() ? matcher.group(1) : null;
  }

  public  StackTraceExpander(@NotNull String stackTraceLinePrefix, @NotNull String stackTraceCauseLinePrefix);

}