precompiled regular expressions

Hi, whats the right way to precompile a regular expression that gets used multiple times without changing. I don't think I can use /o, because the specific line of code which performs the pattern match is used to check various patterns against various values at various times. None the less,

Re: Pattern Match

Since we're now talking about performance issues, somebody should say something about precompiling the regular expression, when you can, with either /o or qr(). I had a process's running time go from 2min 45sec to just under 24sec simply by using qr on the relevant regular expressions. Robert

the ref() function: what does it mean when ...

Hi list, This question has to do with the ref() built-in function and its return values.   I see that one possible return value is 'REF', which I am inferring to mean that the argument given to ref() is a reference to a scalar which is itself a reference.  However, I have not seen this documen

RE: Why would I learn PERL ??

If you choose software engineering as a career you'll prolly learn like 25 languages.  Perl is just so damn handy -- it's easy to do things you'll frequently want to do -- that it's likely to be one of them.  If you're not a software engineer, then Perl is a good language for casual programmers

anon ref to scalar?

I'm working on a clone method for an object (which makes a deep copy of the data structure and all other data structures 'contained' by it). I'm trying to create a new reference that refers to the same thing an existing reference points to, but is actually a separate reference, so that you get

Re: anon ref to scalar?

James Edward Gray II <[EMAIL PROTECTED]> wrote: >I believe you just want: > >$new = $orig; > >You're trying to copy the reference and = generally means copy. > >> print "orig:$orig, new:$new\n"; True, but ... (1) the requirement for a deep copy is that you can modify anything in the origina

GraphViz::Data::Structure on Win32

Hi list, Does anyone have experience using GraphViz::Data::Structure (http://search.cpan.org/~mcmahon/GraphViz-Data-Structure-0.07/lib/GraphViz/Data/Structure.pm) on Win32, and what was your experience?  Did you get useful results with it and how many hoops did you have to jump through?  Did y

netstat in Perl and OT

Hi list, 1. Does anyone know of a module in CPAN which lets you implement the netstat function within Perl code? I was expecting to see something like netstat.pm, but a CPAN search turned up nothing. 2. If there's no such module, why not? Any guesses? It's seems like the kind of thing that g

DProf and Win32

Hi, Can anyone tell me about using DProf on Win32 and to what extent I can expect meaningful results at all. I'm looking at the following output from DProf and it looks suspect. I'm guessing this has to do with the lack of a high-resolution timer. For example: - elapsed time is negative?

From 5.6.1 to 5.8.2: how preserve installed modules?

Hi, I'm considering upgrading from ActiveState Perl 5.6.1 to 5.8.2 (in order to use the latest Apache and mod_perl, although that's kind of beside the point). Unfortunately, being a Perl beginner, I've installed CPAN modules by a variety of methods including: - manually downloading the .zip from

Using CPAN.PM on Win32: How Direct to Proper Perl Location

Hi, I'm getting an error when trying to install Text::Diff with the CPAN module. The specific error is: *snip* Checking if your kit is complete... Looks good Warning: prerequisite Algorithm::Diff 0 not found. Error: Unable to locate installed Perl libraries or Perl source c

How to import symbols and semantics from one namespace into another

Hi, this question has to do with importing names from one package into another. In my case, both packages reside in the same file, and I simply want to import all the package-global symbols from the one package into the other. Can anyone say how to do this? Here's a bunch of tries that didn't

Re: How to import symbols and semantics from one namespace into another

"Wiggins d Anconia" <[EMAIL PROTECTED]> wrote: > > >> Hi, this question has to do with importing names from one package into >another. In my case, both packages reside in the same file, and I >simply want to import all the package-global symbols from the one >package into the other. Can anyone s

Re: Use and Require

[.. old posts snipped ..] One important difference between 'use' and 'require' has to do with allowing your program to decide whether to include it or not. You CAN put 'require' inside an if statement, and it will only be executed if the if condition is true, allowing your program to decide whe

RE: understanding code

"Nilay Puri, Noida" <[EMAIL PROTECTED]> wrote: >Can any one walk me thru this piece of code :: > >while() >{ >chomp ; >$isbn =(split(/^_/, $_))[0] ; --- not able to understand what is >being accessed (..)[0] >unless ($KEYS{$isbn} ) isbn is a scalar variable, how keys >wok

RESOLUTION: Using CPAN.PM on Win32: How Direct to Proper Perl Location

Hi, this message is to let you know the resolution of an issue I posted on 25 Jan 2004.  I post this for the benefit of anyone Googling on the relevent keywords. My original post listed an error message for a condition in which neither CPAN.pm, CPANPLUS.pm nor Makefile.PL (for multiple packages)

How to tell if subroutine param is filehandle

Hi, Is there a way for a subroutine to tell when it got passed a FILEHANDLE? Running a quick test suggests a way, which is to check the first char of the result of interpolating the subroutine param as a string. Can anyone say whether this is robust and if not what might be a better approach?