diff --git a/part-09/tests/MarkdownParserTest.php b/part-09/tests/MarkdownParserTest.php
index 29b4f9f..d3fb057 100644
--- a/part-09/tests/MarkdownParserTest.php
+++ b/part-09/tests/MarkdownParserTest.php
@@ -27,4 +27,12 @@ public function testBoldTextCanBeParsed()
         $r = $m->parseBold($e);
         $this->assertEquals('foo<strong>bar</strong>baz', $r);
     }
+
+    public function testDoubleBoldTextCanBeParsed()
+    {
+        $m = new MarkdownParser;
+        $e = 'foo**bar**baz**boo**';
+        $r = $m->parseBold($e);
+        $this->assertEquals('foo<strong>bar</strong>baz<strong>boo</strong>', $r);
+    }
 }
diff --git a/part-10/src/Example/MarkdownParser.php b/part-10/src/Example/MarkdownParser.php
index 4506691..345d55a 100644
--- a/part-10/src/Example/MarkdownParser.php
+++ b/part-10/src/Example/MarkdownParser.php
@@ -12,7 +12,7 @@ class MarkdownParser
      */
     public function parseBold($source)
     {
-        $pattern = '/\*\*(.*)\*\*/';
+        $pattern = '/\*\*(.*)\*\*/U';
         $replace = '<strong>$1</strong>';
         return preg_replace($pattern, $replace, $source);
     }
diff --git a/part-10/tests/MarkdownParserTest.php b/part-10/tests/MarkdownParserTest.php
index 7f15711..a867228 100644
--- a/part-10/tests/MarkdownParserTest.php
+++ b/part-10/tests/MarkdownParserTest.php
@@ -27,4 +27,12 @@ public function testBoldTextCanBeParsed()
         $r = $m->parseBold($e);
         $this->assertEquals('foo<strong>bar</strong>baz', $r);
     }
+
+    public function testDoubleBoldTextCanBeParsed()
+    {
+        $m = new MarkdownParser;
+        $e = 'foo**bar**baz**boo**';
+        $r = $m->parseBold($e);
+        $this->assertEquals('foo<strong>bar</strong>baz<strong>boo</strong>', $r);
+    }
 }