Here, I found solution by myself.
buttons: [
{
extend: 'csvHtml5',
text: 'Export to Csv',
exportOptions: {
format: {
body: function ( data, row, column, node, type ) {
if(column==0){
var lines = data.split('<div');
var count_d = 0;
jQuery.each(lines, function() {
if(count_d==0){
data = this;
}
count_d++;
});
}
else{
data = data;
}
return data;
}
}
}
}
],