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PERL: Matching multiple patterns


PERL: Matching multiple patterns

By : user2955031
Date : November 22 2020, 10:33 AM
seems to work fine I have a block of text that looks like this , Reading the whole file at a time :
code :
$ perl -0ne '
    print $1, $2, $3, $4 if
        /
            \047 Name    \047:\s*(.*?\n).*?
            \047 Header  \047:\s*(.*?\n).*?
            \047 Message \047:\s*(.*)
        /sx
' file
$ perl -0ne '
    print @+{qw/Name Header Message/} if 
    /
        \047 Name    \047:\s*(?<Name>    .*?\n).*?
        \047 Header  \047:\s*(?<Header>  .*?\n).*?
        \047 Message \047:\s*(?<Message> .*?\n)
    /sx
' file
John
Oct  1 19:00:12 2014  
Multiple lines of text here


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How do I use Perl's smart matching to match many patterns at once?

How do I use Perl's smart matching to match many patterns at once?


By : Abdul Rehman
Date : March 29 2020, 07:55 AM
help you fix your problem I was trying to follow some examples to use smart matching in the following piece of code, but failed (nothing was filtered out). How can I use smart matching here to match against multiple regexes at once? , Here is a quick untested change to your example:
code :
my @regexes_to_filter_a = (qr/^tmp$/, qr/^temp/, qr/del/);
my @organism_dirs = (); # this will hold final list of dirs to processs

my @subdirs = File::Find::Rule->directory->maxdepth(1)->in($root_dir);
foreach my $subdir (@subdirs) {

    unless (basename($subdir) ~~ @regexes_to_filter_a) {
        push @organism_dirs, $subdir;
    }
}
my @regexes_to_filter_a = ("tmp", "temp", "del");
unless (basename($subdir) ~~ @regexes_to_filter_a) { ... }
Matching two overlapping patterns with Perl

Matching two overlapping patterns with Perl


By : stenub
Date : March 29 2020, 07:55 AM
I hope this helps . The following uses a zero-width assertion (I believe that's what it's called).
code :
#!/usr/bin/perl
use strict;
use warnings;

$_ = "betalphabetabeta";

while (/(?=(alpha|beta))/g) {
    print $1, "\n"; 
C:\Old_Data\perlp>perl t9.pl
beta
alpha
beta
beta
Custom grok patterns - matching multiple patterns

Custom grok patterns - matching multiple patterns


By : user3437530
Date : March 29 2020, 07:55 AM
help you fix your problem I've asked a similar question before but not had any responses so figured it was time to reword it in the hope of receiving some much needed help. , Try this:
INPUT:
code :
This is a document with a lengthy text it contains a number of paragraphs and at the end I'll add some markers that indicate additional information I'd like to pull out and add as additional fields. This is the end of the actual document with additional information being added prior to the closing bracket of the RTF.

additionalfield1: this is information associated with additionalfield1

additionalfield2: information associated with additionalfield2
additionalfield1: (?<additionalfield1>([^,]*))additionalfield2: (?<additionalfield2>([^,]*))
{
  "additionalfield1": [
    [
      "this is information associated with additionalfield1\n\n"
    ]
  ],
  "additionalfield2": [
    [
      "information associated with additionalfield2"
    ]
  ]
}
How to get many matched patterns from multiple patterns match in perl

How to get many matched patterns from multiple patterns match in perl


By : Alexandro
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Simply add a /g modifier to your match:
Deleting N matching patterns using sed, awk, perl etc

Deleting N matching patterns using sed, awk, perl etc


By : J Pes
Date : October 12 2020, 11:00 PM
hop of those help? I have this situation, the file contains , This might work for you (GNU sed):
code :
sed 'N;/^abcd\nvwxyz$/d;P;D' file
sed ':a;N;s/[^\n]\+/&/2;Ta;/^abcd\nvwxyz$/d;P;D' file
sed ':a;N;s/[^\n]\+/&/3;Ta;/^line1\nline2\nline3$/d;P;D' file
sed -z 's/^abcd\nvwxyz\n//mg' file
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