Forums Scripts & Popups replacing letters

k it works but now how to i make it so it can can more then one letter?
cause this won't work
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on *:input:*:{
if ( $left($1,1) != / ) {
msg $active $replace($1-,o,0)
halt
}
if ( $left($1,1) != / ) {
msg $active $replace($1-,w,\/\/)
halt
}
}
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