def get_crash_signature(error_line):
    """Try to get a crash signature from the given error_line string."""
    search_term = None
    match = CRASH_RE.match(error_line)
    if match and is_helpful_search_term(match.group(1)):
        search_term = match.group(1)
    return search_term
Try to get a crash signature from the given error_line string.