[Serusers] replace in textops...doesnt seem to replace

[Iqbal]

Hi

Obvioulsy my day for asking dumb question, but I have the following code,
and am trying to do a simple replace, but in debug..seems like nuthing
happens

if (uri=~"^sip:0.*@.*") {
                replace("0","43");
}
{...}

but no replace, now it should replace the first 0 with 43

any ideas
Iqbal