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thank you very much guys ... i was hoping that there is an algebraic formula that would enable me to do this check but seems pretty tough without using complex algorithm (regex is doing very complex stuff behind the scene ...)

What is the formula to check if a number string includes a number > 6 followed by a number > 5? ex: 3765 is fine because 7 > 6 and 6 > 5 116 is not good 1 < 6 but 189 is good because 8 > 6 and 9 > 5