Change inline URL matcher to only match strings, not newlines. Fixes #1689

middleman-core/lib/middleman-core/util.rb

@@ -332,7 +332,9 @@ module Middleman
 
     Contract String, String, ArrayOf[String], Proc => String
     def rewrite_paths(body, _path, exts, &_block)
-      body.dup.gsub(/([=\'\"\(,]\s*)([^\s\'\"\)>]+(#{Regexp.union(exts)}))/) do |match|
+      matcher = /([=\'\"\(,] *)([^\s\'\"\)>]+(#{Regexp.union(exts)}))/
+
+      body.dup.gsub(matcher) do |match|
         opening_character = $1
         asset_path = $2