Fixed regex: now accepts 1-letter attributes

Fixed htmlparser.js so that attributes whose name is just one letter are
accepted.
For instance  <rect x="50" y="20" width="150" height="150">
wasn't recognized, despite of being formally correct: the regular
expression stopped before "x="

Author: lucapierobon

htmlparser.js

@@ -31,9 +31,9 @@
 (function () {
 
 	// Regular Expressions for parsing tags and attributes
-	var startTag = /^<([-A-Za-z0-9_]+)((?:\s+[a-zA-Z_:][-a-zA-Z0-9_:.]+(?:\s*=\s*(?:(?:"[^"]*")|(?:'[^']*')|[^>\s]+))?)*)\s*(\/?)>/,
+	var startTag = /^<([-A-Za-z0-9_]+)((?:\s+[a-zA-Z_:][-a-zA-Z0-9_:.]*(?:\s*=\s*(?:(?:"[^"]*")|(?:'[^']*')|[^>\s]+))?)*)\s*(\/?)>/,
 		endTag = /^<\/([-A-Za-z0-9_]+)[^>]*>/,
-		attr = /([a-zA-Z_:][-a-zA-Z0-9_:.]+)(?:\s*=\s*(?:(?:"((?:\\.|[^"])*)")|(?:'((?:\\.|[^'])*)')|([^>\s]+)))?/g;
+		attr = /([a-zA-Z_:][-a-zA-Z0-9_:.]*)(?:\s*=\s*(?:(?:"((?:\\.|[^"])*)")|(?:'((?:\\.|[^'])*)')|([^>\s]+)))?/g;
 
 	// Empty Elements - HTML 5
 	var empty = makeMap("area,base,basefont,br,col,frame,hr,img,input,link,meta,param,embed,command,keygen,source,track,wbr");