--- /dev/null
+'use strict';
+
+var attributeName = '[a-zA-Z_:][a-zA-Z0-9:._-]*';
+var unquoted = '[^"\'=<>`\\u0000-\\u0020]+';
+var singleQuoted = '\'[^\']*\'';
+var doubleQuoted = '"[^"]*"';
+var attributeValue = '(?:' + unquoted + '|' + singleQuoted + '|' + doubleQuoted + ')';
+var attribute = '(?:\\s+' + attributeName + '(?:\\s*=\\s*' + attributeValue + ')?)';
+var openTag = '<[A-Za-z][A-Za-z0-9\\-]*' + attribute + '*\\s*\\/?>';
+var closeTag = '<\\/[A-Za-z][A-Za-z0-9\\-]*\\s*>';
+var comment = '<!---->|<!--(?:-?[^>-])(?:-?[^-])*-->';
+var processing = '<[?].*?[?]>';
+var declaration = '<![A-Za-z]+\\s+[^>]*>';
+var cdata = '<!\\[CDATA\\[[\\s\\S]*?\\]\\]>';
+
+exports.openCloseTag = new RegExp('^(?:' + openTag + '|' + closeTag + ')');
+
+exports.tag = new RegExp('^(?:' +
+ openTag + '|' +
+ closeTag + '|' +
+ comment + '|' +
+ processing + '|' +
+ declaration + '|' +
+ cdata +
+')');