add quirky raw tag parsing

lib/liquid/tags/raw.rb

@@ -14,7 +14,7 @@ module Liquid
   # @liquid_syntax_keyword expression The expression to be output without being rendered.
   class Raw < Block
     Syntax = /\A\s*\z/
-    FullTokenPossiblyInvalid = /\A(.*)#{TagStart}#{WhitespaceControl}?\s*(\w+)\s*(.*)?#{WhitespaceControl}?#{TagEnd}\z/om
+    FullTokenPossiblyInvalid = /\A(.*)#{TagStart}#{WhitespaceControl}?[^\w\d]*(\w+)[^\w\d]*(.*)?#{WhitespaceControl}?#{TagEnd}\z/om
 
     def initialize(tag_name, markup, parse_context)
       super

test/integration/parsing_quirks_test.rb

@@ -131,4 +131,16 @@ class ParsingQuirksTest < Minitest::Test
   def test_contains_in_id
     assert_template_result(' YES ', '{% if containsallshipments == true %} YES {% endif %}', { 'containsallshipments' => true })
   end
+
+  def test_delimiter_can_have_characters_after
+    assert_template_result('123', "{% if true %}123{% endif this is a valid syntax %}")
+  end
+
+  def test_none_breaking_whitespaces_in_tag
+    assert_template_result('123', "{% raw %}123{%\u{00A0}endraw\u{00A0}%}")
+
+    assert_template_result('123', "{% raw %}123{%\u{2000}endraw%}")
+
+    assert_template_result('123', "{% raw %}123{%endraw\u{200B}%}")
+  end
 end # ParsingQuirksTest