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Re^6: Is it safe to use external strings for regexes?

by dave_the_m (Monsignor)
on Oct 08, 2021 at 07:01 UTC ( [id://11137335] : note . print w/replies, xml ) Need Help??


in reply to Re^5: Is it safe to use external strings for regexes?
in thread Is it safe to use external strings for regexes?

hm, we seem to be talking about different things
I thought we were talking about using strings obtained from an external source (such as a file or DB) as a regex, and whether the (?{...}) feature could be exploited in that case. The example you gave of concatting two halves of a regex still requires the code to be literal in the source (albeit split) to not need 'use re eval' in the src code, even prior to 5.18.0.

Dave.

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Re^7: Is it safe to use external strings for regexes?
by LanX (Saint) on Oct 08, 2021 at 10:01 UTC
    As I said, I'm thankful that your change rules out

    ''=~ ( '(?{B' . 'EGIN{print "owned"}})' )

    to happen.

    Like this I have a chance to statically check for BEGIN or use re before running perl -c

    (sorry eyepopslikeamosquito :)

    Cheers Rolf
    (addicted to the Perl Programming Language :)
    Wikisyntax for the Monastery