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/^(a)_(b)_(w*)$/.match("a_b_c_d_e_f_g").captures # => ["a", "b", "c_d_e_f_g"]
/^(a)_(b)_(w*)$/.match("a_b_c_d_e_f_g").captures.last # =>"c_d_e_f_g"
/^find_(all_by|by)_([_a-zA-Z]w*)$/.match("find_by_a_and_b_and_c").captures.last # => "a_and_b_and_c"
Rails动态find_by
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