# Buggy code
def rulefromstring(cls, stringline):
    pattern = None

    rule_type = ""
    rule_control = ""
    rule_module_path = ""
    rule_module_args = ""
    complicated = False

    if "[" in stringline:
        pattern = re.compile(
            r"""([\-A-Za-z0-9_]+)\s*         # Rule Type
                    \[([A-Za-z0-9_=\s]+)\]\s*    # Rule Control
                    ([A-Za-z0-9/_\-\.]+)\s*         # Rule Path
                    ([A-Za-z0-9,_=<>\-\s\./]*)""",  # Rule Args
            re.X,
        )
        complicated = True
    else:
        pattern = re.compile(
            r"""([\-A-Za-z0-9_]+)\s*        # Rule Type
                    ([A-Za-z0-9_]+)\s*          # Rule Control
                    ([A-Za-z0-9/_\-\.]+)\s*        # Rule Path
                    ([A-Za-z0-9,_=<>\-\s\./]*)""",  # Rule Args
            re.X,
        )

    result = pattern.match(stringline)

    rule_type = result.group(1)
    if complicated:
        rule_control = "[" + result.group(2) + "]"
    else:
        rule_control = result.group(2)
    rule_module_path = result.group(3)
    if result.group(4) is not None:
        rule_module_args = result.group(4)

    return cls(rule_type, rule_control, rule_module_path, rule_module_args)


# Traceback (AttributeError)
The full traceback is:
Traceback (most recent call last):
File "/tmp/ansible_TpFc0r/ansible_module_pamd.py", line 651, in <module>
main()
File "/tmp/ansible_TpFc0r/ansible_module_pamd.py", line 606, in main
pamd.load_rules_from_file()
File "/tmp/ansible_TpFc0r/ansible_module_pamd.py", line 328, in load_rules_from_file
self.load_rules_from_string(stringline)
File "/tmp/ansible_TpFc0r/ansible_module_pamd.py", line 344, in load_rules_from_string
self.rules.append(PamdRule.rulefromstring(stringline))
File "/tmp/ansible_TpFc0r/ansible_module_pamd.py", line 279, in rulefromstring
rule_type = result.group(1)
AttributeError: 'NoneType' object has no attribute 'group'

# Fixed code
def rulefromstring(cls, stringline):
    pattern = None

    rule_type = ""
    rule_control = ""
    rule_module_path = ""
    rule_module_args = ""
    complicated = False

    if "[" in stringline:
        pattern = re.compile(
            r"""([\-A-Za-z0-9_]+)\s*         # Rule Type
                    \[([A-Za-z0-9_=\s]+)\]\s*    # Rule Control
                    ([A-Za-z0-9/_\-\.]+)\s*         # Rule Path
                    ([A-Za-z0-9,_=<>\-\s\./]*)""",  # Rule Args
            re.X,
        )
        complicated = True
    else:
        pattern = re.compile(
            r"""([@\-A-Za-z0-9_]+)\s*        # Rule Type
                    ([A-Za-z0-9_\-]+)\s*          # Rule Control
                    ([A-Za-z0-9/_\-\.]*)\s*        # Rule Path
                    ([A-Za-z0-9,_=<>\-\s\./]*)""",  # Rule Args
            re.X,
        )

    result = pattern.match(stringline)
    rule_type = result.group(1)
    if complicated:
        rule_control = "[" + result.group(2) + "]"
    else:
        rule_control = result.group(2)
    rule_module_path = result.group(3)
    if result.group(4) is not None:
        rule_module_args = result.group(4)

    return cls(rule_type, rule_control, rule_module_path, rule_module_args)