Only use patten matches if there is not an exact match

lib/open_gem/common_options.rb

@@ -14,16 +14,29 @@ def add_latest_version_option
       end
     end
 
+    def add_exact_match_option
+      add_option('-x', '--exact',
+                 'Only list exact matches') do |value, options|
+        options[:exact] = true
+      end
+    end
+
     def get_spec(name)
-      dep = Gem::Dependency.new /#{Regexp.escape name}/, options[:version]
+      dep = Gem::Dependency.new(name, options[:version])
       specs = Gem.source_index.search(dep)
       if block_given?
         specs = specs.select{|spec| yield spec}
       end
 
       if specs.length == 0
-        say "'#{name}' is not available"
-        return nil
+        # If we have not tried to do a pattern match yet, fall back on it.
+        if(!options[:exact] && !name.is_a?(Regexp))
+          pattern = /#{Regexp.escape name}/
+          get_spec(pattern)
+        else
+          say "'#{name}' is not available"
+          return nil
+        end
 
       elsif specs.length == 1 || options[:latest]
         return specs.last

lib/rubygems/commands/open_command.rb

@@ -12,6 +12,7 @@ def initialize
     add_command_option
     add_latest_version_option
     add_version_option
+    add_exact_match_option
   end
 
   def arguments # :nodoc:

lib/rubygems/commands/read_command.rb

@@ -12,6 +12,7 @@ def initialize
     add_command_option "Application to read rdoc with"
     add_latest_version_option
     add_version_option
+    add_exact_match_option
   end
 
   def arguments # :nodoc: