Hyperlinking arbitrary strings in IMs

[Erigami Scholey-Fuller]

Howdy,

   I'm looking for a plugin that will hyperlink an arbitrary string in
an instant message, and run some user defined program when user clicks
on it.

   My use case is pretty simple: whenever the regex "bug (\d+)"
matches, I'd like to run "firefox $1" (where $1 matches the bracketed
text in the regex). Is there a plugin that provides this feature?

thanks,
e