When you use /e then the stuff in the second part of s/// needs to be valid Perl code. $1md5sum($2)$3 is not valid Perl code; you need to add some concatenation operators (.) in there...

$xml =~ s/(\<tag\>)(\d{11})(\<\/tag\>)/$1.md5_hex($2).$3/eg;

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Or, prettier:

$xml =~ s{ (<tag>) (\d{11}) (</tag>) }{
   $1 . md5_hex($2) . $3
}xeg;

[download]
use Moops; class Cow :rw { has name => (default => 'Ermintrude') }; say Cow->new->name"

In reply to Re: Regex substitute with both a sub and other data by tobyink
in thread Regex substitute with both a sub and other data by FloydATC

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