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  • $\begingroup$ Wait a minute, why can't you use _?(Context @@ # == "X`" &) ? $\endgroup$ Commented Jan 21, 2013 at 15:41
  • $\begingroup$ @Mr.Wizard Context expects a symbol or string, so Context[X`x[]] generates an error. $\endgroup$ Commented Jan 21, 2013 at 15:44
  • $\begingroup$ Why would it see that in your example? How else are you using this pattern? $\endgroup$ Commented Jan 21, 2013 at 15:45
  • $\begingroup$ I don't think I understand your requirements so I've lifted my vote for the time being. I cannot figure out what you're actually trying to match. It seems to me that something like a_Symbol[___] /; Context[a] === "X`" may be better. Would you please try to explain in more detail what you're doing? $\endgroup$ Commented Jan 21, 2013 at 15:50
  • $\begingroup$ @Mr.Wizard that would work just as well, and I figured the answers would be straight forward. $\endgroup$ Commented Jan 21, 2013 at 16:04