diff --git a/Library/Homebrew/extend/pathname.rb b/Library/Homebrew/extend/pathname.rb
index 2c3d5a0259..1c7dcb2c8a 100644
--- a/Library/Homebrew/extend/pathname.rb
+++ b/Library/Homebrew/extend/pathname.rb
@@ -131,7 +131,7 @@ class Pathname
     return $1 if $1
 
     # eg. foobar-4.5.1b
-    /-((\d+\.)*\d+([abc]|rc\d))$/.match stem
+    /-((\d+\.)*\d+([abc]|rc|RC\d))$/.match stem
     return $1 if $1
 
     # eg foobar-4.5.0-beta1
@@ -143,7 +143,7 @@ class Pathname
     return $1 if $1
 
     # eg foobar-4.5.0-bin
-    /-((\d+\.)+\d+[abc]?)[-.](bin|src|sources?)$/.match stem
+    /-((\d+\.)+\d+[abc]?)[-.](bin|stable|src|sources?)$/.match stem
     return $1 if $1
 
     # eg. otp_src_R13B (this is erlang's style)