Perl - 正则表达式问题

Question

我有以下代码来获取字符串中的子字符串,我正在使用正则表达式,但它们似乎无法正常工作.我该怎么做？

我有这个字符串:

vlex.es/jurisdictions/ES/search?textolibre=transacciones+banco+de+bogota&translated_textolibre=,300,220,00:00:38,2,0.00%,38.67%,€0.00

我想得到这个子字符串:

transacciones+banco+de+bogota

代码:

open my $info, $myfile or die "Could not open $myfile: $!";

while (my $line = <$info>) {
    if ($line =~ m/textolibre=/) {
        my $line =~ m/textolibre=(.*?)&translated/g;
        print $1;
    }

    last if $. == 3521239;
}

close $info;

错误:

Use of uninitialized value $line in pattern match (m//) at classifier.pl line 10, <$info> line 20007.
Use of uninitialized value $1 in print at classifier.pl line 11, <$info> line 20007.

Answer 1

您正在使用错误的工具来完成工作.您可以使用URI模块及其URI::QueryParam模块来提取参数:

use strict;
use warnings;
use URI;
use URI::QueryParam;

my $str = "ivlex.es/jurisdictions/ES/search?textolibre=transacciones+banco+de+bogota&translated_textolibre=,300,220,00:00:38,2,0.00%,38.67%,0.00";

my $u = URI->new($str); 
print $u->query_param('textolibre');

输出:

transacciones banco de bogota