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Re^2: Putting the stringified Regexp object into code

by sedusedan (Monk)
on Nov 06, 2012 at 18:59 UTC ( #1002560=note: print w/ replies, xml ) Need Help??


in reply to Re: Putting the stringified Regexp object into code
in thread Putting the stringified Regexp object into code

Yup, I am specifically generating Perl code (as string). The resulting code can be eval()-ed or embedded in other source code.


Comment on Re^2: Putting the stringified Regexp object into code
Re^3: Putting the stringified Regexp object into code
by kennethk (Monsignor) on Nov 06, 2012 at 19:10 UTC

    How are you embedding? This sounds like something you should be solving using modules if you need to share the result among multiple scripts. But as I said, the code should stand as is. I would point out that the qr in $code = "if (\$data =~ qr/$re/) { blah() }"; is unnecessary.


    #11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

      Please see my reply to Anomalous. I am generating a Perl code in a string, where $re will become literal in the generated code. The qr// can be replaced with m//, but it's rather necessary.
        No, it's not necessary -- I said the qr was unnecessary, not qr//.
        #!/usr/bin/perl use strict; use warnings; my $re = qr(/); $re =~ s!/!\\/!g; my $code = "if (\$data =~ /$re/) { blah() }"; my $data = '/'; eval $code; sub blah { print "hi" }

        I understand that you are auto-generating code; perhaps roboticus's response in Re^3: Putting the stringified Regexp object into code will make my point more clearly. There are times when string evaluated code is appropriate, but this would not be a time I'd select it.


        #11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

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