set_rules($field[, $label = ''[, $rules = '']])
reset_validation()
set_error_delimiters([$prefix = ' '[, $suffix = ' ']])
error_array()
error_string([$prefix = ''[, $suffix = '']])
run([$group = ''])
has_rule($field)
set_message($lang[, $val = ''])
error($field[, $prefix = ''[, $suffix = '']])
set_data($data)
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