diff --git a/wp-includes/formatting.php b/wp-includes/formatting.php
index f8d1e74264..2bfb1376b6 100644
--- a/wp-includes/formatting.php
+++ b/wp-includes/formatting.php
@@ -174,9 +174,9 @@ function wptexturize($text, $reset = false) {
 
 		// Dashes and spaces
 		$dynamic[ '/---/' ] = $em_dash;
-		$dynamic[ '/(?<=' . $spaces . ')--(?=' . $spaces . ')/' ] = $em_dash;
+		$dynamic[ '/(?<=^|' . $spaces . ')--(?=$|' . $spaces . ')/' ] = $em_dash;
 		$dynamic[ '/(?<!xn)--/' ] = $en_dash;
-		$dynamic[ '/(?<=' . $spaces . ')-(?=' . $spaces . ')/' ] = $en_dash;
+		$dynamic[ '/(?<=^|' . $spaces . ')-(?=$|' . $spaces . ')/' ] = $en_dash;
 
 		$dynamic_characters['dash'] = array_keys( $dynamic );
 		$dynamic_replacements['dash'] = array_values( $dynamic );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index af30bea307..80f226ebf2 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-alpha-31197';
+$wp_version = '4.2-alpha-31199';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.