Need help with acpi event string splitting

Dear listreaders

I have a minimal default.sh that used to configure what the acpi events do trigger.

#!/bin/sh
# Default acpi script that takes an entry for all actions

set $*

group=${1/\/*/}
action=${1/*\//}

My problem now is that I would like to extend those filter, but I don't know how. My event that I would like to parse looks like this:
ibm/hotkey HKEY 00000080 00001003

I'd like to have a expression that returns the last for digit if the group corresponds to ibm and action to hotkey. hotkeynr=${???}

I tried to write a pcre but I lack the knowledge or it's not a pcre that 's used here so if someone could point me it would be nice.

Greetings Simon

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