diff --git a/wp-includes/js/shortcode.js b/wp-includes/js/shortcode.js
index 34766fb651..7028f6a8bd 100644
--- a/wp-includes/js/shortcode.js
+++ b/wp-includes/js/shortcode.js
@@ -135,7 +135,7 @@ window.wp = window.wp || {};
 			// 6. an unquoted value.
 			// 7. A numeric attribute in double quotes.
 			// 8. An unquoted numeric attribute.
-			pattern = /(\w+)\s*=\s*"([^"]*)"(?:\s|$)|(\w+)\s*=\s*\'([^\']*)\'(?:\s|$)|(\w+)\s*=\s*([^\s\'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|(\S+)(?:\s|$)/g;
+			pattern = /([\w-]+)\s*=\s*"([^"]*)"(?:\s|$)|([\w-]+)\s*=\s*'([^']*)'(?:\s|$)|([\w-]+)\s*=\s*([^\s'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|(\S+)(?:\s|$)/g;
 
 			// Map zero-width spaces to actual spaces.
 			text = text.replace( /[\u00a0\u200b]/g, ' ' );
diff --git a/wp-includes/js/shortcode.min.js b/wp-includes/js/shortcode.min.js
index b3a8f5212d..8544d1417c 100644
--- a/wp-includes/js/shortcode.min.js
+++ b/wp-includes/js/shortcode.min.js
@@ -1 +1 @@
-window.wp=window.wp||{},function(){wp.shortcode={next:function(a,b,c){var d,e,f=wp.shortcode.regexp(a);return f.lastIndex=c||0,(d=f.exec(b))?"["===d[1]&&"]"===d[7]?wp.shortcode.next(a,b,f.lastIndex):(e={index:d.index,content:d[0],shortcode:wp.shortcode.fromMatch(d)},d[1]&&(e.content=e.content.slice(1),e.index++),d[7]&&(e.content=e.content.slice(0,-1)),e):void 0},replace:function(a,b,c){return b.replace(wp.shortcode.regexp(a),function(a,b,d,e,f,g,h,i){if("["===b&&"]"===i)return a;var j=c(wp.shortcode.fromMatch(arguments));return j?b+j+i:a})},string:function(a){return new wp.shortcode(a).string()},regexp:_.memoize(function(a){return new RegExp("\\[(\\[?)("+a+")(?![\\w-])([^\\]\\/]*(?:\\/(?!\\])[^\\]\\/]*)*?)(?:(\\/)\\]|\\](?:([^\\[]*(?:\\[(?!\\/\\2\\])[^\\[]*)*)(\\[\\/\\2\\]))?)(\\]?)","g")}),attrs:_.memoize(function(a){var b,c,d={},e=[];for(b=/(\w+)\s*=\s*"([^"]*)"(?:\s|$)|(\w+)\s*=\s*\'([^\']*)\'(?:\s|$)|(\w+)\s*=\s*([^\s\'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|(\S+)(?:\s|$)/g,a=a.replace(/[\u00a0\u200b]/g," ");c=b.exec(a);)c[1]?d[c[1].toLowerCase()]=c[2]:c[3]?d[c[3].toLowerCase()]=c[4]:c[5]?d[c[5].toLowerCase()]=c[6]:c[7]?e.push(c[7]):c[8]&&e.push(c[8]);return{named:d,numeric:e}}),fromMatch:function(a){var b;return b=a[4]?"self-closing":a[6]?"closed":"single",new wp.shortcode({tag:a[2],attrs:a[3],type:b,content:a[5]})}},wp.shortcode=_.extend(function(a){_.extend(this,_.pick(a||{},"tag","attrs","type","content"));var b=this.attrs;this.attrs={named:{},numeric:[]},b&&(_.isString(b)?this.attrs=wp.shortcode.attrs(b):_.isEqual(_.keys(b),["named","numeric"])?this.attrs=b:_.each(a.attrs,function(a,b){this.set(b,a)},this))},wp.shortcode),_.extend(wp.shortcode.prototype,{get:function(a){return this.attrs[_.isNumber(a)?"numeric":"named"][a]},set:function(a,b){return this.attrs[_.isNumber(a)?"numeric":"named"][a]=b,this},string:function(){var a="["+this.tag;return _.each(this.attrs.numeric,function(b){a+=/\s/.test(b)?' "'+b+'"':" "+b}),_.each(this.attrs.named,function(b,c){a+=" "+c+'="'+b+'"'}),"single"===this.type?a+"]":"self-closing"===this.type?a+" /]":(a+="]",this.content&&(a+=this.content),a+"[/"+this.tag+"]")}})}(),function(){wp.html=_.extend(wp.html||{},{attrs:function(a){var b,c;return"/"===a[a.length-1]&&(a=a.slice(0,-1)),b=wp.shortcode.attrs(a),c=b.named,_.each(b.numeric,function(a){/\s/.test(a)||(c[a]="")}),c},string:function(a){var b="<"+a.tag,c=a.content||"";return _.each(a.attrs,function(a,c){b+=" "+c,""!==a&&(_.isBoolean(a)&&(a=a?"true":"false"),b+='="'+a+'"')}),a.single?b+" />":(b+=">",b+=_.isObject(c)?wp.html.string(c):c,b+"</"+a.tag+">")}})}();
\ No newline at end of file
+window.wp=window.wp||{},function(){wp.shortcode={next:function(a,b,c){var d,e,f=wp.shortcode.regexp(a);return f.lastIndex=c||0,(d=f.exec(b))?"["===d[1]&&"]"===d[7]?wp.shortcode.next(a,b,f.lastIndex):(e={index:d.index,content:d[0],shortcode:wp.shortcode.fromMatch(d)},d[1]&&(e.content=e.content.slice(1),e.index++),d[7]&&(e.content=e.content.slice(0,-1)),e):void 0},replace:function(a,b,c){return b.replace(wp.shortcode.regexp(a),function(a,b,d,e,f,g,h,i){if("["===b&&"]"===i)return a;var j=c(wp.shortcode.fromMatch(arguments));return j?b+j+i:a})},string:function(a){return new wp.shortcode(a).string()},regexp:_.memoize(function(a){return new RegExp("\\[(\\[?)("+a+")(?![\\w-])([^\\]\\/]*(?:\\/(?!\\])[^\\]\\/]*)*?)(?:(\\/)\\]|\\](?:([^\\[]*(?:\\[(?!\\/\\2\\])[^\\[]*)*)(\\[\\/\\2\\]))?)(\\]?)","g")}),attrs:_.memoize(function(a){var b,c,d={},e=[];for(b=/([\w-]+)\s*=\s*"([^"]*)"(?:\s|$)|([\w-]+)\s*=\s*'([^']*)'(?:\s|$)|([\w-]+)\s*=\s*([^\s'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|(\S+)(?:\s|$)/g,a=a.replace(/[\u00a0\u200b]/g," ");c=b.exec(a);)c[1]?d[c[1].toLowerCase()]=c[2]:c[3]?d[c[3].toLowerCase()]=c[4]:c[5]?d[c[5].toLowerCase()]=c[6]:c[7]?e.push(c[7]):c[8]&&e.push(c[8]);return{named:d,numeric:e}}),fromMatch:function(a){var b;return b=a[4]?"self-closing":a[6]?"closed":"single",new wp.shortcode({tag:a[2],attrs:a[3],type:b,content:a[5]})}},wp.shortcode=_.extend(function(a){_.extend(this,_.pick(a||{},"tag","attrs","type","content"));var b=this.attrs;this.attrs={named:{},numeric:[]},b&&(_.isString(b)?this.attrs=wp.shortcode.attrs(b):_.isEqual(_.keys(b),["named","numeric"])?this.attrs=b:_.each(a.attrs,function(a,b){this.set(b,a)},this))},wp.shortcode),_.extend(wp.shortcode.prototype,{get:function(a){return this.attrs[_.isNumber(a)?"numeric":"named"][a]},set:function(a,b){return this.attrs[_.isNumber(a)?"numeric":"named"][a]=b,this},string:function(){var a="["+this.tag;return _.each(this.attrs.numeric,function(b){a+=/\s/.test(b)?' "'+b+'"':" "+b}),_.each(this.attrs.named,function(b,c){a+=" "+c+'="'+b+'"'}),"single"===this.type?a+"]":"self-closing"===this.type?a+" /]":(a+="]",this.content&&(a+=this.content),a+"[/"+this.tag+"]")}})}(),function(){wp.html=_.extend(wp.html||{},{attrs:function(a){var b,c;return"/"===a[a.length-1]&&(a=a.slice(0,-1)),b=wp.shortcode.attrs(a),c=b.named,_.each(b.numeric,function(a){/\s/.test(a)||(c[a]="")}),c},string:function(a){var b="<"+a.tag,c=a.content||"";return _.each(a.attrs,function(a,c){b+=" "+c,""!==a&&(_.isBoolean(a)&&(a=a?"true":"false"),b+='="'+a+'"')}),a.single?b+" />":(b+=">",b+=_.isObject(c)?wp.html.string(c):c,b+"</"+a.tag+">")}})}();
\ No newline at end of file
diff --git a/wp-includes/shortcodes.php b/wp-includes/shortcodes.php
index 0042877e17..057fad73be 100644
--- a/wp-includes/shortcodes.php
+++ b/wp-includes/shortcodes.php
@@ -450,6 +450,17 @@ function unescape_invalid_shortcodes( $content ) {
         return $content;
 }
 
+/**
+ * Retrieve the shortcode attributes regex.
+ *
+ * @since 4.4.0
+ *
+ * @return string The shortcode attribute regular expression
+ */
+function get_shortcode_atts_regex() {
+	return '/([\w-]+)\s*=\s*"([^"]*)"(?:\s|$)|([\w-]+)\s*=\s*\'([^\']*)\'(?:\s|$)|([\w-]+)\s*=\s*([^\s\'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|(\S+)(?:\s|$)/';
+}
+
 /**
  * Retrieve all attributes from the shortcodes tag.
  *
@@ -467,7 +478,7 @@ function unescape_invalid_shortcodes( $content ) {
  */
 function shortcode_parse_atts($text) {
 	$atts = array();
-	$pattern = '/([\w-]+)\s*=\s*"([^"]*)"(?:\s|$)|([\w-]+)\s*=\s*\'([^\']*)\'(?:\s|$)|([\w-]+)\s*=\s*([^\s\'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|(\S+)(?:\s|$)/';
+	$pattern = get_shortcode_atts_regex();
 	$text = preg_replace("/[\x{00a0}\x{200b}]+/u", " ", $text);
 	if ( preg_match_all($pattern, $text, $match, PREG_SET_ORDER) ) {
 		foreach ($match as $m) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 4c57bc0701..641098d3b2 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34932';
+$wp_version = '4.4-alpha-34933';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.