diff --git a/lib/docx_replace.rb b/lib/docx_replace.rb
index 42368bb..b8c6a26 100644
--- a/lib/docx_replace.rb
+++ b/lib/docx_replace.rb
@@ -6,7 +6,9 @@
 
 module DocxReplace
   class Doc
-    attr_reader :document_content
+    DOCUMENT_FILE_PATH = 'word/document.xml'
+
+    attr_accessor :document_contents
 
     def initialize(path, temp_dir=nil)
       @zip_file = Zip::File.new(path)
@@ -15,20 +17,28 @@ def initialize(path, temp_dir=nil)
     end
 
     def replace(pattern, replacement, multiple_occurrences=false)
-      replace = replacement.to_s
+      replace = replacement.to_s.encode(xml: :text)
       if multiple_occurrences
-        @document_content.force_encoding("UTF-8").gsub!(pattern, replace)
+        @document_contents.keys.each do |name|
+          @document_contents[name].force_encoding("UTF-8").gsub!(pattern, replace)
+        end
       else
-        @document_content.force_encoding("UTF-8").sub!(pattern, replace)
+        @document_contents.keys.each do |name|
+          @document_contents[name].force_encoding("UTF-8").sub!(pattern, replace)
+        end
       end
     end
 
-    def matches(pattern)
-      @document_content.scan(pattern).map{|match| match.first}
+    def matches(pattern, unique = false)
+      if unique
+        @document_contents[DOCUMENT_FILE_PATH].scan(pattern).map{|match| match.first}
+      else
+        @document_contents[DOCUMENT_FILE_PATH].scan(pattern).flatten.inject(Hash.new(0)) { |hash, key| hash[key] += 1; hash }
+      end
     end
 
     def unique_matches(pattern)
-      matches(pattern)
+      matches(pattern, true)
     end
 
     alias_method :uniq_matches, :unique_matches
@@ -39,10 +49,16 @@ def commit(new_path=nil)
     end
 
     private
-    DOCUMENT_FILE_PATH = 'word/document.xml'
 
     def read_docx_file
-      @document_content = @zip_file.read(DOCUMENT_FILE_PATH)
+      @document_contents = {}
+
+      @zip_file.entries.each do |entry|
+        if entry.name.match? /^word\/(document|header[0-9]+|footer[0-9]+).xml/
+          @document_contents[entry.name] = @zip_file.read(entry.name)
+        end
+      end
+
     end
 
     def write_back_to_file(new_path=nil)
@@ -53,14 +69,16 @@ def write_back_to_file(new_path=nil)
       end
       Zip::OutputStream.open(temp_file.path) do |zos|
         @zip_file.entries.each do |e|
-          unless e.name == DOCUMENT_FILE_PATH
+          unless @document_contents.keys.include? e.name
             zos.put_next_entry(e.name)
             zos.print e.get_input_stream.read
           end
         end
 
-        zos.put_next_entry(DOCUMENT_FILE_PATH)
-        zos.print @document_content
+        @document_contents.each do |name, content|
+          zos.put_next_entry(name)
+          zos.print content
+        end
       end
 
       if new_path.nil?
diff --git a/lib/docx_replace/version.rb b/lib/docx_replace/version.rb
index 992ad3c..8f1a022 100644
--- a/lib/docx_replace/version.rb
+++ b/lib/docx_replace/version.rb
@@ -1,3 +1,3 @@
 module DocxReplace
-  VERSION = "1.0.3"
+  VERSION = "1.0.4"
 end