Improve query valid regex

Now a query string cannot look like 'foo=bar=foo' anymore.

lib/zero/patches/uri.rb

@@ -18,7 +18,6 @@ module URI
       return self.decode_www_form_18 query
     end
 
-
     # Own implementation of decode_www_form.
     # Shall behave almost like the original method, but without any encoding
     # stuff.
@@ -28,7 +27,8 @@ module URI
     #
     def self.decode_www_form_18(query)
       return [] if query.empty?
-      unless query.match '='
+
+      unless query.match /^[^#=;&]*=[^#=;&]*([;&][^#=;&]*=[^#=;&]*)*$/
         raise ArgumentError,
           "invalid data of application/x-www-form-urlencoded (#{query})"
       end

spec/unit/uri/parse_query_string_spec.rb

@@ -114,6 +114,32 @@ describe URI, '#parse_query_string' do
     result.should eq([])
   end
 
-  # what happend on more than one = without an & or ; in between?
+  it 'throws an error, if more than one = without an & or ; in between' do
+    expect {
+      result = URI::parse_query_string("foo=bar=foo&bar=foo=bar")
+    }.to raise_error(
+      ArgumentError,
+      "invalid data of application/x-www-form-urlencoded "+
+       "(foo=bar=foo&bar=foo=bar)"
+    )
+  end
+
+  it 'throws an error, if more than one & without an = in between' do
+    expect {
+      result = URI::parse_query_string("foo&bar=foo&bar")
+    }.to raise_error(
+      ArgumentError,
+      "invalid data of application/x-www-form-urlencoded (foo&bar=foo&bar)"
+    )
+  end
+
+  it 'throws an error, if more than one ; without an = in between' do
+    expect {
+      result = URI::parse_query_string("foo;bar=foo;bar")
+    }.to raise_error(
+      ArgumentError,
+      "invalid data of application/x-www-form-urlencoded (foo;bar=foo;bar)"
+    )
+  end
 
 end