$var = “10WW51”;
($yy,$ww) = ($var =~ /(\d\d)WW(\d\d)/);
You’ll have $yy = 10, and $ww = 51.
For this example, you can use split function, but for more complicated pattern, say,
$var = “This WW data is from 10WW51.”;
You’ll have a more complex way to extract the year and week information if you are using split function.