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my @array = ("PSTR_0", "PSTR_1",   "PSTR_2","PSTR_3","PSTR_4", "PSTW_0
+","PSTW_1","PSTW_2","PSTW_3","PSTW_4",
"PWWD_3","PWWD_2","PWWD_1","PWWD_0");

#!/usr/bin/perl

...

my @PWWD = (grep{m/PWWD_\d/}@array);
print @PWWD,"\n"