Regex accepts/rejects words check apparently crashes

[Willem3141]

Reported by Wouter. Possibly a timeout? But then we need to properly show that error.

Example (but happens with others as well):

((b+aa*b)(aa*b)*ba*b)*(b+aa*b)(aa*b)*

Checks:

[{"type":"check","module":"accepting","method":"regex_accepts","arguments":{"word_list":"aaaaaaaaaaaaaab\naaaabaaaaaaaaab\nbaaabaaaaabaaab"}},{"type":"grade","points":"25","continue":true},{"type":"check","module":"accepting","method":"regex_rejects","arguments":{"word_list":"aaaaaabb\naaabbaaa\naaaaaaaa\naaabaaaa"}},{"type":"grade","points":"25","continue":true},{"type":"check","module":"equivalence","method":"language_equivalence_words","arguments":{"word_list":"ababbbbab aaaabab bbaaabab bbbaaab baaaabab babaab bab ababaaab bbabaabab abbbbab aaabbbbab abbaaaabb bbababab baabbabb baababab aaabab bbabbab ababab aabbbbab abaaabaab babaaabab baaabbbab baaaabbbb abbbaaaab aaaababab bbbbaaaab bbbbbbb abaabaab baaabab baaaaaaab aabbabbab aaaabbabb bbbbabbbb bbabbbbab abaaabab baabbbb aabbaabb aaaaabab abbabaaab aaab ababbbab bbabab baaaab abaaaabab bbaaabaab abaabbbb aabbbaab baaababab aababbbb aababbabb baaaaabab aabbabaab aaabbbab bbaaabb bababaab bbbbbabb bbababbbb bbbabbbab aabbbb aabaaab aabaaaaab abbaabb babbbbbbb ababaaaab bbbbbbab baababbbb baabaaaab aababbbab bbbabab aaababab bbbab aababaab baaaaaab babbbbab aab babbbb bbabaaab aabbbabab ababaab aabbbab aaabaab babbabb bbbaabaab bbbaaaaab b bbbb abbababab babbbbaab abaabaaab ababbbaab aaabbbb babaabab aaaaabbbb aabaab aaaaab baabbaabb aabbaaabb aabbabb abbbabbbb abababbbb abbbaabab aabaabab babbaabb baabaabab bababbbb baababaab bababbbab abbaabbab aabab abbabaab bbaabbaab bbbaaabab bbbaab bbbbabab baabab abbaabaab aabbabab aabababab aaabbaabb bbbbbabab abbbaab aaabaabab abbabab babbaaabb aabaaabab aaaaaaab baaabaaab babababab babaabaab abaab aaabaaab aaaabbbab bbabbabab bbaabaab abbbb babaaaaab abaaaab aabbaabab bababab aaabaaaab abbbbbbb aaaaaabab abaababab abbaaabb baabbabab aaababbbb abbbbabab babbabbab abaaaaaab babbbabab ababbbb aaababaab abaabbabb bbbbaab abbabb baabbbbab babaabbbb abbbbbabb bbabb baabaaab abbbabaab abbbbaab bbbabaaab bbaabab baaabbabb aabaabbbb ababbabb bbabbbabb aaaaabaab aaabbbaab baabbbab bbbaabab abaaab abbbbbbab babbaabab abbbab bbabbaaab baaaaab abbbaaab babbbab bbabaab bbbbbbaab abab abababab babab bbaaabbab bbbabbbb bbbbbaabb ab baaab baaabaab abbbbaaab bbbabbabb aababaaab babbabab bbabaaaab aabaabaab babaaaab bbbbbbbab aaaaaaaab abaabbbab bbaabbbbb baaaabaab aaaaaab bbbbabaab bbabbbbb abbaaabab abbabbaab aaabbabb abbaabab bbaababab bbababaab abaaabbbb abbabbab bbabbaab aababab bbbaaaab aabbbbaab abbbabab baab baabaab babaaab bbaaaaabb babbabaab bbaabb baabbbaab bbbbaaab abababaab abaabab aabbbbbbb aaaab ababaabab babbbaaab aaaabbbb bbbbaabab bababaaab bbaabbab bbbbab abaaaaab bbbabaab aabaaaab bbaaaabb baaabbbb bbbababab aaabbabab bbbaabbbb bbaaaabab ababbaabb bbaabaaab aaaabaaab aaaabaab ababbabab aabbbaaab babbbaab abbabbbbb bababbabb","length":"9"}},{"type":"grade","points":"50","continue":true}]

Correct answer:

a*b(aa*b+ba*ba*b)*

[Willem3141]

It was a time-limit. Let's just set 8 as the upper limit for this check.