I probably would have gone for 

$res = $str =~ s{ \d+ }{ $& =~ tr//3/cr }xer;

[download]

or 

$res = $str =~ s{ \d+ }{ 3 x length $& }xer;

[download]

TMTOWTDI gone wild :)

In reply to Re^3: regex in REPLACEMENT in s/// by tybalt89
in thread regex in REPLACEMENT in s/// by perlboy_emeritus

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