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I'm trying to upgrade some code to run correctly in Perl 5.14. However, I still need it to work in older version of perl.

I would like to have certain code execute only if Perl 5.14 is detected. Essentially I'm looking for something similar to the #if MACRO #endif construct in C.

My specific use case is that I need use re '/d/'; in order for some existing regular expressions to want with 5.14 but earlier Perl versions will give a compile error if I add this pragma.

Considering that /d is the default, why even bother? If you aren't using use re '/l'; or use re '/u'; in an outer scope, there's no need to do use re '/d'; in an inner. Quoting from perlre:
If none of the above apply, for backwards compatibility reasons, the "/d" modifier is the one in effect by default. As this can lead to unexpected results, it is best to specify which other rule set should be used.

In reply to Re: Conditionally executing different code based on Perl Version by JavaFan
in thread Conditionally executing different code based on Perl Version by dlarochelle

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