I think he rather cared about the few core principles behind the rules, no? From Luke 10, for example:
> On one occasion an expert in the law stood up to test Jesus. "Teacher," he asked, "what must I do to inherit eternal life?" "What is written in the Law?" he replied. "How do you read it?" He answered, "'Love the Lord your God with all your heart and with all your soul and with all your strength and with all your mind'; and, 'Love your neighbor as yourself.'" "You have answered correctly," Jesus replied. "Do this and you will live."
Further complicated by the fact that he came to fulfill old promises and replace the old rules. From Luke 6, for example:
> One Sabbath Jesus was going through the grainfields, and his disciples began to pick some heads of grain, rub them in their hands and eat the kernels. Some of the Pharisees asked, "Why are you doing what is unlawful on the Sabbath?" Jesus answered them, "Have you never read what David did when he and his companions were hungry? He entered the house of God, and taking the consecrated bread, he ate what is lawful only for priests to eat. And he also gave some to his companions." Then Jesus said to them, "The Son of Man is Lord of the Sabbath."
Or as summarized by his followers 20 years after his death and resurrection, in Galatians 3:
> Before the coming of this faith, we were held in custody under the law, locked up until the faith that was to come would be revealed. So the law was our guardian until Christ came that we might be justified by faith. Now that this faith has come, we are no longer under a guardian.