endsWithLtr static method
Determines if the exit directionality (ie, the last strongly-directional
character in text is LTR. If isHtml is true, the text is HTML or
HTML-escaped.
Implementation
static bool endsWithLtr(String text, [isHtml = false]) {
  return RegExp('[$_LTR_CHARS][^$_RTL_CHARS]*\$')
      .hasMatch(isHtml ? stripHtmlIfNeeded(text) : text);
}