It would be easier to help if you said what you were trying to do...(you said you wanted to replace o with 0, but what do you want to do with the text you get?)
$replace is used like this:
I want to replace the
e in the word
hello with the letter
b, so I use this:
//echo -a $replace(
hello,
e,
b)
on *:INPUT:*: {
if ( o isin $1- ) {
msg $active $replace($1-,o,0)
halt
}
}
^I
think that will do what you are trying to.