I was reading O'Reilly's Programming Perl, and under the
security section it says that regular expressions from outside the
program are not trusted because it is possible that they can take
forever to execute.
I was curious exactly what kind of regular expression takes
forever to execute? Are these common, and is it possible that I can
accidentally take forever to use a regular expression? Can anyone
provide me with more information then O'Reilly's "some regular
expressions take an exponential time to execute"?
Thanks in advance,
-Dan
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