s{\\((v)|[0-7]{1,3}|.)}{$2 ? "\013" : eval qq{qq{$&}}}eg;

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Part of the enormous speed penalty may be attributable not only to eval, but to the use of the  $& matching special variable (see Variables related to regular expressions in perlvar), which can work wonders for putting the brakes on not just an individual regex, but on the execution of every regex in an application!

In reply to Re^3: C strings, unescaping of by AnomalousMonk
in thread C strings, unescaping of by Anonymous Monk

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