Added support for specifying a prerelease that is prefixed with a dash.

lib/versionomy/format_definitions/semver.rb

@@ -150,10 +150,10 @@ def self.create
           end
 
           # The optional prerelease field is represented as a string
-          # beginning with an alphabetic character.
+          # beginning with an alphabetic character or a dash.
           field(:prerelease_suffix) do
-            recognize_regexp('[a-zA-Z][0-9a-zA-Z-]*', :default_value_optional => true,
-                             :delimiter_regexp => '', :default_delimiter => '')
+            recognize_regexp('[a-zA-Z][0-9a-zA-Z\-]*', :default_value_optional => true,
+                             :delimiter_regexp => '\-?', :default_delimiter => '')
           end
         end
       end

test/tc_rubygems_basic.rb

@@ -37,7 +37,7 @@
 
 require 'test/unit'
 require 'versionomy'
-
+require 'yaml'
 
 module Versionomy
   module Tests  # :nodoc:

test/tc_semver_basic.rb

@@ -37,7 +37,7 @@
 
 require 'test/unit'
 require 'versionomy'
-
+require 'yaml'
 
 module Versionomy
   module Tests  # :nodoc:
@@ -130,6 +130,13 @@ def test_parsing_with_string
         assert_equal('1.9.2pre2', value_.unparse)
       end
 
+      # Test parsing with a string with a prerelease prefixed by a dash.
+
+      def test_parsing_with_string_with_prerelease_prefixed_by_dash
+        value_ = ::Versionomy.parse('1.9.2-pre2-1', :semver)
+        assert_equal([1, 9, 2, 'pre2-1'], value_.values_array)
+        assert_equal('1.9.2-pre2-1', value_.unparse)
+      end
 
       # Test making sure unparsing requires all three fields.
 

test/tc_standard_misc.rb

@@ -37,7 +37,7 @@
 
 require 'test/unit'
 require 'versionomy'
-
+require 'yaml'
 
 module Versionomy
   module Tests  # :nodoc: