new tag regex handles angle brackets in attributes

fixes #768

Author: Hugh Greenish

bits/22_xmlutils.js

@@ -1,5 +1,5 @@
 var attregexg=/([^"\s?>\/]+)=((?:")([^"]*)(?:")|(?:')([^']*)(?:')|([^'">\s]+))/g;
-var tagregex=/<[^>]*>/g;
+var tagregex=/<[\/\?]?[a-zA-Z0-9:]+(?:\s+[^"\s?>\/]+=(?:"[^"]*"|'[^']*'|[^'">\s]+))*\s?[\/\?]?>/g;
 var nsregex=/<\w*:/, nsregex2 = /<(\/?)\w+:/;
 function parsexmltag(tag/*:string*/, skip_root/*:?boolean*/)/*:any*/ {
 	var z = ({}/*:any*/);

xlsx.flow.js

@@ -1664,7 +1664,7 @@ function resolve_path(path/*:string*/, base/*:string*/)/*:string*/ {
 	return result.join('/');
 }
 var attregexg=/([^"\s?>\/]+)=((?:")([^"]*)(?:")|(?:')([^']*)(?:')|([^'">\s]+))/g;
-var tagregex=/<[^>]*>/g;
+var tagregex=/<[\/\?]?[a-zA-Z0-9:]+(?:\s+[^"\s?>\/]+=(?:"[^"]*"|'[^']*'|[^'">\s]+))*\s?[\/\?]?>/g;
 var nsregex=/<\w*:/, nsregex2 = /<(\/?)\w+:/;
 function parsexmltag(tag/*:string*/, skip_root/*:?boolean*/)/*:any*/ {
 	var z = ({}/*:any*/);

xlsx.js

@@ -1600,7 +1600,7 @@ function resolve_path(path, base) {
 	return result.join('/');
 }
 var attregexg=/([^"\s?>\/]+)=((?:")([^"]*)(?:")|(?:')([^']*)(?:')|([^'">\s]+))/g;
-var tagregex=/<[^>]*>/g;
+var tagregex=/<[\/\?]?[a-zA-Z0-9:]+(?:\s+[^"\s?>\/]+=(?:"[^"]*"|'[^']*'|[^'">\s]+))*\s?[\/\?]?>/g;
 var nsregex=/<\w*:/, nsregex2 = /<(\/?)\w+:/;
 function parsexmltag(tag, skip_root) {
 	var z = ({});