fix variable output with quoted strings containing pipe ("|") characters

lib/liquid/variable.rb

@@ -11,16 +11,17 @@ module Liquid
   #   {{ user | link }}
   #
   class Variable
+    FilterParser = /(?:#{FilterSeparator}|(?:\s*(?!(?:#{FilterSeparator}))(?:#{QuotedFragment}|\S+)\s*)+)/
     attr_accessor :filters, :name
 
     def initialize(markup)
       @markup  = markup
       @name    = nil
       @filters = []
-      if match = markup.match(/\s*(#{QuotedFragment})/)
+      if match = markup.match(/\s*(#{QuotedFragment})(.*)/)
         @name = match[1]
-        if markup.match(/#{FilterSeparator}\s*(.*)/)
-          filters = Regexp.last_match(1).split(/#{FilterSeparator}/)
+        if match[2].match(/#{FilterSeparator}\s*(.*)/)
+          filters = Regexp.last_match(1).scan(FilterParser)
           filters.each do |f|
             if matches = f.match(/\s*(\w+)/)
               filtername = matches[1]

test/standard_filter_test.rb

@@ -116,6 +116,10 @@ class StandardFiltersTest < Test::Unit::TestCase
     assert_equal 'a a a', @filters.remove_first("a a a a", 'a ')        
     assert_template_result 'a a a', "{{ 'a a a a' | remove_first: 'a ' }}"
   end
+  
+  def test_pipes_in_string_arguments 
+    assert_template_result 'foobar', "{{ 'foo|bar' | remove: '|' }}"
+  end
                                                                                      
   def test_strip_newlines
     assert_template_result 'abc', "{{ source | strip_newlines }}", 'source' => "a\nb\nc"