<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def match_entry_line(str_to_match, regex_obj=MAIN_REGEX_OBJ):
 """Does a regex match of the mount entry string"""

    match_obj = regex_obj.match(str_to_match)
    if not match_obj:
        error_message = ('Line "%s" is unrecognized by overlay4u. '
                'This is only meant for use with Ubuntu Linux.')
        raise UnrecognizedMountEntry(error_message % str_to_match)
    return match_obj.groupdict()