I have a fairly simple solution for the scenario you’ve presented. grep, and return some context (maybe +5) and then grep on that again with the argument you’re looking for (give a negative context this time so you get the entire function call)

That being said, as unlikely that scenario is, having it all in 1 line does not work either. The problem is that its very likely/possible that the true argument will be passed in in the form of a variable. So you’re back to needing something that is more code aware anyways.