Improve Pathname#text_executable? regexp

file(1) does not allow leading whitespace on shebang lines, and there
appears to be no restrictions on what characters follow '#!', either.

While at it, fix an erroneous shebang test.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/Library/Homebrew/extend/pathname.rb b/Library/Homebrew/extend/pathname.rb
index d171a6d6b..907679f99 100644
--- a/Library/Homebrew/extend/pathname.rb
+++ b/Library/Homebrew/extend/pathname.rb
@@ -272,7 +272,7 @@ class Pathname
   end
 
   def text_executable?
-    %r[#!\s*(/.+)+] === open('r') { |f| f.readline }
+    %r[^#!\s*.+] === open('r') { |f| f.readline }
   rescue EOFError
     false
   end