Perl：匹配两个文件中的数据

Question

我想匹配并打印两个文件（File1.txt 和 File2.txt）中的数据。目前，我正在尝试将 File1 中第二列的第一个字母与 File2.txt 中第三列的第一个字母匹配。

File1.txt
1  H  35
1  C  22
1  H  20

File2.txt
A  1 HB2 MET  1 
A  2 CA  MET  1
A  3 HA  MET  1

OUTPUT
1  MET  HB2  35
1  MET  CA   22
1  MET  HA   20 

这是我的脚本，我已尝试按照此提交：In Perl, mapping between a reference file and a series of files

#!/usr/bin/perl

use strict;
use warnings;

my %data;

open (SHIFTS,"file1.txt") or die;
open (PDB, "file2.txt") or die;

while (my $line = <PDB>) {
    chomp $line;
    my @fields = split(/\t/,$line);
    $data{$fields[4]} = $fields[2];
 }

 close PDB;

 while (my $line = <SHIFTS>) {
    chomp($line);
    my @columns = split(/\t/,$line);
    my $value = ($columns[1] =~ m/^.*?([A-Za-z])/ );
 }
    print "$columns[0]\t$fields[3]\t$value\t$data{$value}\n";

 close SHIFTS;
 exit;

Answer 1

这是使用 split() 黑客的一种方法：

#!/usr/bin/perl

use strict;
use warnings;
use Data::Dumper;

my $f1 = 'file1.txt';
my $f2 = 'file2.txt';

my @pdb;

open my $pdb_file, '<', $f2
  or die "Can't open the PDB file $f2: $!";

while (my $line = <$pdb_file>){
    chomp $line;
    push @pdb, $line; 
}

close $pdb_file;

open my $shifts_file, '<', $f1
  or die "Can't open the SHIFTS file $f1: $!";

while (my $line = <$shifts_file>){

    chomp $line;

    my $pdb_line = shift @pdb;

    # - inner split: get the third element from the $pdb_line
    # - outer split: get the first element (character) from the
    #   result of the inner split

    my $criteria = (split('', (split('\s+', $pdb_line))[2]))[0];

    # - compare the 2nd element of the file1.txt line against
    #   the above split() operations

    if ((split('\s+', $line))[1] eq $criteria){
        print "$pdb_line\n";
    }
    else {
        print "**** >$pdb_line< doesn't match >$line<\n";
    }
}

文件：

file1.txt（注意我更改了第二行以确保不匹配有效）：

1  H  35
1  A  22
1  H  20

file2.txt：

A  1 HB2 MET  1 
A  2 CA  MET  1
A  3 HA  MET  1

输出：

./app.pl
A  1 HB2 MET  1 
****>A  2 CA  MET  1< doesn't match >1  A  22<
A  3 HA  MET  1