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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 height=80px align="left" width=80px >
<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>
<table height=80px width=80px>
<tr>
<td>
</td>
</tr>
</table>
String str = "<table name=mytable align=left>\r\n" +
" <tr>\r\n" +
" <td>\r\n" +
" </td>\r\n" +
" </tr>\r\n" +
"</table>\r\n" +
"<div name=tt align=right>\r\n" +
"</div>\r\n" +
"<table width=80px align= left>\r\n" +
" <tr>\r\n" +
" <td>\r\n" +
" </td>\r\n" +
" </tr>\r\n" +
"</table>\r\n" +
"<table height=80px align=\"left\" width=80px >\r\n" +
" <tr>\r\n" +
" <td>\r\n" +
" </td>\r\n" +
" </tr>\r\n" +
"</table>";
String regex = "(?i:(<table\\s+[^>]*\\b)align\\s*=\\s*(['\"]?)(left|right|center)\\2)";
System.out.println(str.replaceAll(regex, "$1"));