Re: use of constants in regex substitutions?

You can treat constants as subroutines (which they are). In your case, the statement should look something like this:

$s1 =~ s/&TXT_EXTENSION/&MIF_EXTENSION/e;
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Note the 'e' quantifier after the regex -- this tells the engine to evaluate the substitute before the substitution.

Update: this code is incorrect, thanks to 3dan for pointing this out.

Comment on Re: use of constants in regex substitutions? Download Code

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Re: Re: use of constants in regex substitutions? by edan (Curate) on Sep 23, 2003 at 11:45 UTC
That won't work, because the `/e` modifier only applies to the second part of the substitution (i.e. the 'substitute with...' part). The first part of the regex follows normal string-interpolation rules, and `"&sub"` is NOT interpolated in a string any more than "sub" is. This regexp looks for the literal text '&TXT_EXTENSION', and substitutes it with '.mif'. See Zazo's reply for a correct answer. -- 3dan	[reply]
Re: Re: Re: use of constants in regex substitutions? by dmitri (Priest) on Sep 23, 2003 at 13:59 UTC
You're right; I should've tested first. How come &sub is interpolated when using arrow operator? `&sub => "xyz";` [download] AFAIK, this is equivalent to `"&sub", "xyz";` [download]	[reply] [d/l] [select]
Re: Re: Re: Re: use of constants in regex substitutions? by edan (Curate) on Sep 23, 2003 at 14:32 UTC
Well, I believe the `=>` operator forces a bareword to its left to be interpreted as a string. But `&sub` isn't a bareword it's a subroutine call, so it works like you want it to. At least, this is my understanding. Hopefully someone will correct me if I'm wrong. -- 3dan	[reply]