aGrep doesn't work (CM)
I've tested and it worked on Stock ROM (Nexus 4) but it didn't work on AOSP based ROMs as far as I know (I tested on 2 CyanogenMod 11 ROMs - Galaxy S2, Motorola MotoG, tested on snapshot M11/M12).
I've contacted the author, he's been supportive but I think he doesn't believe is a common issue, so, he's not fixing for now.
Can you check if this application works, (usage is straightforward, it's like grep but with a GUI), and remove it from f-droid or contact author if it doesn't.