RE: Regex search using scalar

[Paul Harwood]

The search patterns I am looking for are contained inside the list (each
element of the list is going to be used to scan an entire log file). So
if ( /match/ ) needs to reference each element of the FOREACH loop
which I will have nested inside a while FILENAME loop. That's what's
confusing me.

-Original Message-
From: news [mailto:[EMAIL PROTECTED] On Behalf Of Tore Aursand
Posted At: Wednesday, November 05, 2003 5:12 AM
Posted To: Perl
Conversation: Regex search using scalar
Subject: Re: Regex search using scalar

On Tue, 04 Nov 2003 20:41:17 -0800, Paul Harwood wrote:
 I would like to enumerate a list and search through each element like
 so:
 [...]

Why do you want to enumerate the list?  Do you _really_ need to know the
index of the current element?  If really so:

  my $i = 0;
  foreach ( @list ) {
  $i++;
  if ( /match/ ) {
  # ...
  }
  }

 If (/$logs[i]/)

Please post _real_ Perl code.  The code above has no meaning and won't
even compile.


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Re: Regex search using scalar

[Sudarshan Raghavan]

Paul Harwood wrote:

The search patterns I am looking for are contained inside the list (each
element of the list is going to be used to scan an entire log file). So
if ( /match/ ) needs to reference each element of the FOREACH loop
which I will have nested inside a while FILENAME loop. That's what's
confusing me.
This is a FAQ
perldoc -q 'How do I efficiently match many regular expressions at once'


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Regex search using scalar

[Paul Harwood]

I would like to enumerate a list and search through each element like
so:

 

If (/$logs[i]/)

 

 { # code}

 

 

I know the syntax is wrong so I was hoping someone could explain how to
do this.

 

Thanks.

 

--Paul

 

Re: Regex search using scalar

[Tore Aursand]

On Tue, 04 Nov 2003 20:41:17 -0800, Paul Harwood wrote:
 I would like to enumerate a list and search through each element like
 so:
 [...]

Why do you want to enumerate the list?  Do you _really_ need to know the
index of the current element?  If really so:

  my $i = 0;
  foreach ( @list ) {
  $i++;
  if ( /match/ ) {
  # ...
  }
  }

 If (/$logs[i]/)

Please post _real_ Perl code.  The code above has no meaning and won't
even compile.


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Tore Aursand [EMAIL PROTECTED]


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RE: Regex search using scalar

[Bob Showalter]

Paul Harwood wrote:
 I would like to enumerate a list and search through each element like
 so: 
 
 
 
 If (/$logs[i]/)
 
 
 
  { # code}
 
 
 
 
 
 I know the syntax is wrong so I was hoping someone could
 explain how to
 do this.

If I understand correctly, you want to use grep():

   for (grep /pattern/, @list) {
  ... do something with $_ ...
   }

perldoc -f grep

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RE: Regex search using scalar

[Bob Showalter]

Paul Harwood wrote:
 Thanks.
 
 Can I substitute /pattern/ with a scalar though?

Yes.

   grep $_ eq 'string', @list

 
 -Original Message-
 From: Bob Showalter [mailto:[EMAIL PROTECTED]
 Sent: Wednesday, November 05, 2003 5:24 AM
 To: Paul Harwood; Beginner Perl
 Subject: RE: Regex search using scalar
 
 Paul Harwood wrote:
  I would like to enumerate a list and search through each element
  like so: 
  
  
  
  If (/$logs[i]/)
  
  
  
   { # code}
  
  
  
  
  
  I know the syntax is wrong so I was hoping someone could explain
  how to do this.
 
 If I understand correctly, you want to use grep():
 
for (grep /pattern/, @list) {
   ... do something with $_ ...
}
 
 perldoc -f grep


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