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grep { s/\d+/a/ } @dd;

@dd = map { s/\d+/a/r } @dd;

for (@dd) { s/\d+/a/; }

s/\d+/a/ for @dd;

$ perl -E'@dd = 0..9; s/\d+/a/ for @dd;                     say @dd;'
aaaaaaaaaa
...

$ perl -E'@dd = 0..9; s/\d+/a/ for eval { @dd };            say @dd;'
0123456789