Fix handling of word boundaries

spec/compiler/crystal/tools/doc/doc_renderer_spec.cr

@@ -77,7 +77,7 @@ describe Doc::Markdown::DocRenderer do
       end
     end
 
-    pending "doesn't find sibling methods with fake receiver" do
+    it "doesn't find sibling methods with fake receiver" do
       {base, base_foo}.each do |obj|
         assert_code_link(obj, "wrong#bar")
         assert_code_link(obj, "wrong.bar")
@@ -183,7 +183,7 @@ describe Doc::Markdown::DocRenderer do
       end
     end
 
-    pending "finds method of an absolute type" do
+    it "finds method of an absolute type" do
       {base, base_foo}.each do |obj|
         assert_code_link(obj, "::Base::Nested#foo", %(<a href="Base/Nested.html#foo-instance-method">::Base::Nested#foo</a>))
         assert_code_link(obj, "::Base.baz", %(<a href="Base.html#baz-class-method">::Base.baz</a>))
@@ -250,7 +250,7 @@ describe Doc::Markdown::DocRenderer do
       end
     end
 
-    pending "doesn't find type not at word boundary" do
+    it "doesn't find type not at word boundary" do
       {base, base_foo}.each do |obj|
         assert_code_link(obj, "aBase")
       end

src/compiler/crystal/tools/doc/markdown/doc_renderer.cr

@@ -47,12 +47,12 @@ class Crystal::Doc::Markdown::DocRenderer < Crystal::Doc::Markdown::HTMLRenderer
     end
 
     # Check Type#method(...) or Type or #method(...)
-    text.gsub %r(\b
-      ((?:\:\:)?[A-Z]\w+(?:\:\:[A-Z]\w+)*[#\.][\w<=>+\-*\/\[\]&|?!^~]+[?!]?(?:\(.*?\))?)
+    text.gsub %r(
+      ((?:\B\:\:)?\b[A-Z]\w+(?:\:\:[A-Z]\w+)*[#\.][\w<=>+\-*\/\[\]&|?!^~]+[?!]?(?:\(.*?\))?)
         |
-      ((?:\:\:)?[A-Z]\w+(?:\:\:[A-Z]\w+)*)
+      ((?:\B\:\:)?\b[A-Z]\w+(?:\:\:[A-Z]\w+)*)
         |
-      ([#\.][\w<=>+\-*\/\[\]&|?!^~]+[?!]?(?:\(.*?\))?)
+      (\B[#\.][\w<=>+\-*\/\[\]&|?!^~]+[?!]?(?:\(.*?\))?)
       )x do |match_text, match|
       sharp_index = match_text.index('#')
       dot_index = match_text.index('.')