Add debian style names to version checker.

Library/Homebrew/extend/pathname.rb

@@ -146,6 +146,10 @@ class Pathname
     /-((\d+\.)+\d+[abc]?)[-.](bin|stable|src|sources?)$/.match stem
     return $1 if $1
 
+    # Debian style eg dash_0.5.5.1.orig.tar.gz
+    /_((\d+\.)+\d+[abc]?)[.]orig$/.match stem
+    return $1 if $1
+
     # eg. otp_src_R13B (this is erlang's style)
     # eg. astyle_1.23_macosx.tar.gz
     stem.scan /_([^_]+)/ do |match|

Library/Homebrew/test/test_versions.rb

@@ -140,4 +140,14 @@ class VersionTests < Test::Unit::TestCase
     check 'http://www.monkey.org/~provos/libevent-1.4.14b-stable.tar.gz',
       '1.4.14b'
   end
+
+  def test_debian_style_1
+    check 'http://ftp.de.debian.org/debian/pool/main/s/sl/sl_3.03.orig.tar.gz',
+      '3.03'
+  end
+
+  def test_debian_style_2
+    check 'http://ftp.de.debian.org/debian/pool/main/m/mmv/mmv_1.01b.orig.tar.gz',
+      '1.01b'
+  end
 end