diff --git a/components/prism-markup.js b/components/prism-markup.js
index 4738ff5b46..996d9ff460 100644
--- a/components/prism-markup.js
+++ b/components/prism-markup.js
@@ -135,8 +135,7 @@ Object.defineProperty(Prism.languages.markup.tag, 'addAttribute', {
 	value: function (attrName, lang) {
 		Prism.languages.markup.tag.inside['special-attr'].push({
 			pattern: RegExp(
-				/(^|["'\s])(?:__)\s*=\s*(?:"[^"]*"|'[^']*'|[^\s'">=]+(?=[\s>]))/.source
-					.replace(/__/, function () { return attrName; }),
+				/(^|["'\s])/.source + '(?:' + attrName + ')' + /\s*=\s*(?:"[^"]*"|'[^']*'|[^\s'">=]+(?=[\s>]))/.source,
 				'i'
 			),
 			lookbehind: true,
diff --git a/components/prism-markup.min.js b/components/prism-markup.min.js
index 229f6f4b27..08d352668b 100644
--- a/components/prism-markup.min.js
+++ b/components/prism-markup.min.js
@@ -1 +1 @@
-Prism.languages.markup={comment:/<!--[\s\S]*?-->/,prolog:/<\?[\s\S]+?\?>/,doctype:{pattern:/<!DOCTYPE(?:[^>"'[\]]|"[^"]*"|'[^']*')+(?:\[(?:[^<"'\]]|"[^"]*"|'[^']*'|<(?!!--)|<!--(?:[^-]|-(?!->))*-->)*\]\s*)?>/i,greedy:!0,inside:{"internal-subset":{pattern:/(\[)[\s\S]+(?=\]>$)/,lookbehind:!0,greedy:!0,inside:null},string:{pattern:/"[^"]*"|'[^']*'/,greedy:!0},punctuation:/^<!|>$|[[\]]/,"doctype-tag":/^DOCTYPE/,name:/[^\s<>'"]+/}},cdata:/<!\[CDATA\[[\s\S]*?]]>/i,tag:{pattern:/<\/?(?!\d)[^\s>\/=$<%]+(?:\s(?:\s*[^\s>\/=]+(?:\s*=\s*(?:"[^"]*"|'[^']*'|[^\s'">=]+(?=[\s>]))|(?=[\s/>])))+)?\s*\/?>/,greedy:!0,inside:{tag:{pattern:/^<\/?[^\s>\/]+/,inside:{punctuation:/^<\/?/,namespace:/^[^\s>\/:]+:/}},"special-attr":[],"attr-value":{pattern:/=\s*(?:"[^"]*"|'[^']*'|[^\s'">=]+)/,inside:{punctuation:[{pattern:/^=/,alias:"attr-equals"},/"|'/]}},punctuation:/\/?>/,"attr-name":{pattern:/[^\s>\/]+/,inside:{namespace:/^[^\s>\/:]+:/}}}},entity:[{pattern:/&[\da-z]{1,8};/i,alias:"named-entity"},/&#x?[\da-f]{1,8};/i]},Prism.languages.markup.tag.inside["attr-value"].inside.entity=Prism.languages.markup.entity,Prism.languages.markup.doctype.inside["internal-subset"].inside=Prism.languages.markup,Prism.hooks.add("wrap",function(a){"entity"===a.type&&(a.attributes.title=a.content.replace(/&amp;/,"&"))}),Object.defineProperty(Prism.languages.markup.tag,"addInlined",{value:function(a,e){var s={};s["language-"+e]={pattern:/(^<!\[CDATA\[)[\s\S]+?(?=\]\]>$)/i,lookbehind:!0,inside:Prism.languages[e]},s.cdata=/^<!\[CDATA\[|\]\]>$/i;var t={"included-cdata":{pattern:/<!\[CDATA\[[\s\S]*?\]\]>/i,inside:s}};t["language-"+e]={pattern:/[\s\S]+/,inside:Prism.languages[e]};var n={};n[a]={pattern:RegExp("(<__[^>]*>)(?:<!\\[CDATA\\[(?:[^\\]]|\\](?!\\]>))*\\]\\]>|(?!<!\\[CDATA\\[)[^])*?(?=</__>)".replace(/__/g,function(){return a}),"i"),lookbehind:!0,greedy:!0,inside:t},Prism.languages.insertBefore("markup","cdata",n)}}),Object.defineProperty(Prism.languages.markup.tag,"addAttribute",{value:function(a,e){Prism.languages.markup.tag.inside["special-attr"].push({pattern:RegExp("(^|[\"'\\s])(?:__)\\s*=\\s*(?:\"[^\"]*\"|'[^']*'|[^\\s'\">=]+(?=[\\s>]))".replace(/__/,function(){return a}),"i"),lookbehind:!0,inside:{"attr-name":/^[^\s=]+/,"attr-value":{pattern:/=[\s\S]+/,inside:{value:{pattern:/(=\s*(["']|(?!["'])))\S[\s\S]*(?=\2$)/,lookbehind:!0,alias:[e,"language-"+e],inside:Prism.languages[e]},punctuation:[{pattern:/^=/,alias:"attr-equals"},/"|'/]}}}})}}),Prism.languages.html=Prism.languages.markup,Prism.languages.mathml=Prism.languages.markup,Prism.languages.svg=Prism.languages.markup,Prism.languages.xml=Prism.languages.extend("markup",{}),Prism.languages.ssml=Prism.languages.xml,Prism.languages.atom=Prism.languages.xml,Prism.languages.rss=Prism.languages.xml;
\ No newline at end of file
+Prism.languages.markup={comment:/<!--[\s\S]*?-->/,prolog:/<\?[\s\S]+?\?>/,doctype:{pattern:/<!DOCTYPE(?:[^>"'[\]]|"[^"]*"|'[^']*')+(?:\[(?:[^<"'\]]|"[^"]*"|'[^']*'|<(?!!--)|<!--(?:[^-]|-(?!->))*-->)*\]\s*)?>/i,greedy:!0,inside:{"internal-subset":{pattern:/(\[)[\s\S]+(?=\]>$)/,lookbehind:!0,greedy:!0,inside:null},string:{pattern:/"[^"]*"|'[^']*'/,greedy:!0},punctuation:/^<!|>$|[[\]]/,"doctype-tag":/^DOCTYPE/,name:/[^\s<>'"]+/}},cdata:/<!\[CDATA\[[\s\S]*?]]>/i,tag:{pattern:/<\/?(?!\d)[^\s>\/=$<%]+(?:\s(?:\s*[^\s>\/=]+(?:\s*=\s*(?:"[^"]*"|'[^']*'|[^\s'">=]+(?=[\s>]))|(?=[\s/>])))+)?\s*\/?>/,greedy:!0,inside:{tag:{pattern:/^<\/?[^\s>\/]+/,inside:{punctuation:/^<\/?/,namespace:/^[^\s>\/:]+:/}},"special-attr":[],"attr-value":{pattern:/=\s*(?:"[^"]*"|'[^']*'|[^\s'">=]+)/,inside:{punctuation:[{pattern:/^=/,alias:"attr-equals"},/"|'/]}},punctuation:/\/?>/,"attr-name":{pattern:/[^\s>\/]+/,inside:{namespace:/^[^\s>\/:]+:/}}}},entity:[{pattern:/&[\da-z]{1,8};/i,alias:"named-entity"},/&#x?[\da-f]{1,8};/i]},Prism.languages.markup.tag.inside["attr-value"].inside.entity=Prism.languages.markup.entity,Prism.languages.markup.doctype.inside["internal-subset"].inside=Prism.languages.markup,Prism.hooks.add("wrap",function(a){"entity"===a.type&&(a.attributes.title=a.content.replace(/&amp;/,"&"))}),Object.defineProperty(Prism.languages.markup.tag,"addInlined",{value:function(a,e){var s={};s["language-"+e]={pattern:/(^<!\[CDATA\[)[\s\S]+?(?=\]\]>$)/i,lookbehind:!0,inside:Prism.languages[e]},s.cdata=/^<!\[CDATA\[|\]\]>$/i;var t={"included-cdata":{pattern:/<!\[CDATA\[[\s\S]*?\]\]>/i,inside:s}};t["language-"+e]={pattern:/[\s\S]+/,inside:Prism.languages[e]};var n={};n[a]={pattern:RegExp("(<__[^>]*>)(?:<!\\[CDATA\\[(?:[^\\]]|\\](?!\\]>))*\\]\\]>|(?!<!\\[CDATA\\[)[^])*?(?=</__>)".replace(/__/g,function(){return a}),"i"),lookbehind:!0,greedy:!0,inside:t},Prism.languages.insertBefore("markup","cdata",n)}}),Object.defineProperty(Prism.languages.markup.tag,"addAttribute",{value:function(a,e){Prism.languages.markup.tag.inside["special-attr"].push({pattern:RegExp("(^|[\"'\\s])(?:"+a+")\\s*=\\s*(?:\"[^\"]*\"|'[^']*'|[^\\s'\">=]+(?=[\\s>]))","i"),lookbehind:!0,inside:{"attr-name":/^[^\s=]+/,"attr-value":{pattern:/=[\s\S]+/,inside:{value:{pattern:/(=\s*(["']|(?!["'])))\S[\s\S]*(?=\2$)/,lookbehind:!0,alias:[e,"language-"+e],inside:Prism.languages[e]},punctuation:[{pattern:/^=/,alias:"attr-equals"},/"|'/]}}}})}}),Prism.languages.html=Prism.languages.markup,Prism.languages.mathml=Prism.languages.markup,Prism.languages.svg=Prism.languages.markup,Prism.languages.xml=Prism.languages.extend("markup",{}),Prism.languages.ssml=Prism.languages.xml,Prism.languages.atom=Prism.languages.xml,Prism.languages.rss=Prism.languages.xml;
\ No newline at end of file
diff --git a/prism.js b/prism.js
index dcdca24880..19e34a1463 100644
--- a/prism.js
+++ b/prism.js
@@ -1360,8 +1360,7 @@ Object.defineProperty(Prism.languages.markup.tag, 'addAttribute', {
 	value: function (attrName, lang) {
 		Prism.languages.markup.tag.inside['special-attr'].push({
 			pattern: RegExp(
-				/(^|["'\s])(?:__)\s*=\s*(?:"[^"]*"|'[^']*'|[^\s'">=]+(?=[\s>]))/.source
-					.replace(/__/, function () { return attrName; }),
+				/(^|["'\s])/.source + '(?:' + attrName + ')' + /\s*=\s*(?:"[^"]*"|'[^']*'|[^\s'">=]+(?=[\s>]))/.source,
 				'i'
 			),
 			lookbehind: true,