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$ perl -e 'my $s = "xyabcy*+!*+!*+!*+!*+!*+!"; $s =~ y/*+!//d; print +$s, $/;' xyabcy $ perl -e 'my $s = "*+!xyabcy*+!*+!*+!*+!*+!*+!"; $s =~ y/*+!//d; pri +nt $s, $/;' xyabcy $