Increment number?

[cubilas]

Hello!

I am trying to find all instances of a string (<Instrument number="1">) and increment the number in quotes by another number N.

Example :
if N = 30 then \
<Instrument number="1"> will be replaced with <Instrument number="31">
<Instrument number="2"> will be replaced with <Instrument number="32">

Any help would be great, thanks!

[DigitalVolcano]

Sorry, there aren't any maths functions as of version 3.1, so I can't think of a way of doing this!