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.
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