Searching shows re::engine::PCRE as one possible, but is it safe?

This question was asked and not completely answered on stackoverflow:
How can I safely use regexes from user input.

The following is my program(check_pstime), it's a skeleton. The purpose is to collect CPU time information from matched processes, mainly for graphs. I'll admit in this use case it'll be the OP who provides the regex, but this is an important question to have a good solid answer too. Like a CPAN module that will safely build a qr/pattern/ from a tainted string.

Edit:
Moved the source code to github.

In reply to Untaint a string match, regular expression. by cheako

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