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#!/usr/bin/perl

...
my $foo='look! no eval: 3735928559';
$foo=~s/(\d+)/$X{sprintf '0x%08X',$1}/;
print $foo;

>perl eval.pl
look! no eval: 0xDEADBEEF
>

#!/usr/bin/perl

...
my $foo='look! no eval: 3735928559';
$foo=~s/(\d+)/${[sprintf '0x%08X',$1]}[0]/;
print $foo;

>perl eval2.pl
look! no eval: 0xDEADBEEF
>