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str = str.replaceAll("align='left'","");
str = str.replaceAll("align ='left'","");
str = str.replaceAll("align = 'left'","");
str = str.replaceAll("align= 'left'","");
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"));