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<table name=mytable align=left>
<tr>
<td>
</td>
</tr>
</table>
<div name=tt align=right ></div>
<table width=80px align = left>
<tr>
<td>
</td>
</tr>
</table>
<table name=mytable >
<tr>
<td>
</td>
</tr>
</table>
<div name=tt align=right ></div>
<table width=80px >
<tr>
<td>
</td>
</tr>
</table>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Untitled Page</title>
</head>
<body>
<script>
var html ='<table name=mytable align=\'left\'>\
<tr>\
<td>\
</td>\
</tr>\
</table>\
<div name=tt align=right ></div>\
<table width=80px align = "left">\
<tr>\
<td>\
</td>\
</tr>\
</table>\
';
var reg = /(<table[^>]*?)align\s*=\s*(['\"]?)(?:right|left|center)\2([^>]*?>)/gi;
html = html.replace(reg, "$1$3");
alert(html);
</script>
</body>
</html>
var str = "<table name=mytable align=left><tr><td></td></tr></table><div name=tt align=right ></div><table width=80px align = left><tr><td></td></tr></table>";
var reg = /(<table[^>]*?)align\s*=\s*([\'\"]?)(?:left|right|center)\2[^>]*(>)/g;
var newstr = str.replace(reg, "$1>");
alert(newstr);
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>Untitled Page</title>
</head>
<body>
<script>
var html ='<table name=mytable align=left>\
<tr>\
<td>\
</td>\
</tr>\
</table>\
<div name=tt align=right ></div>\
<table width=80px align = left>\
<tr>\
<td>\
</td>\
</tr>\
</table>\
';
var reg = /(<table[^>]*?)align\s*=\s*([\'\"]?)(?:right|left|center)\2([^>]*?>)/gi;
html = html.replace(reg, "$1$3");
alert(html);
</script>
</body>
</html>