Re: negative regex without !~

Replies are listed 'Best First'.
Re^2: negative regex without !~ by grinder (Bishop) on Jul 22, 2004 at 16:55 UTC
I'm going to go out on a limb here and guess it isn't Perl A questionable assumption. Define Perl. One likely scenario is software compiled with the PCRE library. A growing number of applications do so these days. I know Apache will use it if it's there (although I don't know what for... maybe mod_rewrite these days?) and so will Postfix (and I'm a heavy user of it and very happy it's available). A pure-Perl scenario I can envisage is a callback/library situation, where you get to construct an object or otherwise pass a qr/.../ where the design (admittedly somewhat brain-damaged) only admits positive matches. The not, ! and unless solutions in the other responses does one no good if you can't manoeuvre around the code that's doing the matching. So please don't be so hasty in dismissing a person and telling them to go away. I agree the OP should have provided more information, but since it was posted here, maybe it has something to do with Perl? - another intruder with the mooring of the heat of the Perl	[reply]
•Re^3: negative regex without !~ by merlyn (Sage) on Jul 22, 2004 at 21:36 UTC
But "PCRE" isn't Perl, even in spite of the name. And it never can be. It can only be "Perl-like". So if someone has a question about the regex there, they should go to http://perl-like-monks.org, not here! -- Randal L. Schwartz, Perl hacker Be sure to read my standard disclaimer if this is a reply.	[reply]
Re^2: negative regex without !~ by fletcher_the_dog (Friar) on Jul 22, 2004 at 18:58 UTC
There are many perl CGI and Tk programs that ask a user to enter regular expressions. If you are entering a regular expression in an entry box you typically cannot put '!~' on the front of it to negate it. I don't know if this is the kind of thing the original poster is talking about, but it seems like a very possible scenario	[reply]
Re^3: negative regex without !~ by SpanishInquisition (Pilgrim) on Oct 11, 2004 at 16:32 UTC
File::Repl has a function that takes a qr (or a string that will be eval'ed as a regex), for instance. If I want to make a zip of a directory containing all files that are not ending in ".obj" and also do not contain the string "super-secret-gamma-ray-gun", I can't do that with File::Repl and I have to post-match.	[reply]
Re^2: negative regex without !~ by blueAdept (Beadle) on Jul 22, 2004 at 16:56 UTC
I'm fairly sure the `$foo !~ m/../` syntax didn't exist in perl 5.0, but my impression to the original poster's question is that it really doesn't relate to perl itself of any version. I used to have to write a lot of backwards compatible code, so this was useful knowledge.... but who's still using 5.0 these days <grin>	[reply] [d/l]
Re^3: negative regex without !~ by freddo411 (Chaplain) on Jul 22, 2004 at 20:25 UTC
Works in 5.005 but who's still using 5.0 these days? <sheepishly> Me. Some companies haven't upgraded.... </sheepishly> `use strict; print 'Perl version is: ', $]; my @foo = qw/ fee fie fo fum big bag boz /; foreach ( @foo ) { if ( $_ !~ /f/ ) { print "Matched: $_ !~ /f/ " ; } else { print "Failed: $_ !~ /f/ " ; } } Output: Perl version is: 5.00503 Failed: fee !~ /f/ Failed: fie !~ /f/ Failed: fo !~ /f/ Failed: fum !~ /f/ Matched: big !~ /f/ Matched: bag !~ /f/ Matched: boz !~ /f/` [download] ------------------------------------- Nothing is too wonderful to be true -- Michael Faraday	[reply] [d/l]
Re^4: negative regex without !~ by jryan (Vicar) on Jul 23, 2004 at 00:31 UTC
Perl version 5.00503 is essentially Perl 5.5.3; they changed the release version numbers starting with Perl 5.6.0	[reply]
Re^3: negative regex without !~ by sgifford (Prior) on Jul 22, 2004 at 18:17 UTC
No, I recall using `!~` even back in Perl 4.	[reply] [d/l]