One way to do it: 

$_= 'Compruebe si las direcciones URL que encontr\u00e9 en el archivo 
+de configuraci\u00f3n son v\u00e1lidos';
s/\\u(\w{4})/eval "\"\\x{$1}\""/ge;
print;

[download]
perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'

In reply to Re: ASCII encoded unicode strings on web, such as \u00F3 by shmem
in thread ASCII encoded unicode strings on web, such as \u00F3 by igoryonya

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