Here is one from the net:
Bollinger Bands formula 7 day
enter long
high>(mov(Close,20,S)-std(Close,20,2)) and
ref(low,-7)<ref((mov(Close,20,S)-std(Close,20,2)),-7)
exit long
close<(mov(Close,20,S)+std(Close,20,2)) and
ref(close,-7)>ref((mov(Close,20,S)+std(Close,20,2)),-7)
and
Mov((RSI(14)- LLV(RSI(14),14))
/(HHV(RSI(14),14)-(LLV(RSI(14),14))),14,E)*100<70 and
ref((Mov((RSI(14)- LLV(RSI(14),14))
/(HHV(RSI(14),14)-(LLV(RSI(14),14))),14,E)*100),-3)>70
and
(mov(Close,20,S)+std(Close,20,2))>(mov(c,89,s)+(.062*(mov(c,89,s))))