def parse_sms_text(text)
parsed_text = text.scan(/^([a-zA-Z0-9]+)(\s[a-zA-Zа-яА-Я0-9\s\@\$\_\!\#\%\&\'\(\)\*\+\,\-\.\/\:\;\<\=\>\?\^\{\}\\\[\~\]\|]+)?$/u).flatten
end

parse_sms_text(params[:sms_text])   #Via GET request ?sms_text=sup123123
=> Empty Array

parse_sms_text('sup123123') # same as in params[:sms_text]
=> ['sup123123',nil] # Result that i need!

Where to dig?