我已经编写了这段代码,但它不起作用。有人可以指出这个问题吗?
sub match_ip()
{
my $ip = "The IP address is 216.108.225.236:60099";
if($ip =~ /(\d{1-3}\.\d{1-3}\.\d{1-3}\.\d{1-3}\:\d{1-5})/)
{
print "$1\n";
}
}
编辑:我只想提取 IP 地址,不做任何验证。
更改{1-3}
为{1,3}
相同{1-5}
->{1,5}
本着 TIMTOWTDI 的精神,这里是另一个: 的Regexp::Common::net
部分Regexp::Common
可能有你想要的正则表达式。
或者,您可以使用Data::Validate::IP
, 并注意它无法识别端口,因此您必须split
on :
。
use strict;
use warnings;
use Data::Validate::IP;
my $ip_with_port="216.108.225.236:60099";
my $ip=(split /:/,$ip_with_port)[0];
my $validator=Data::Validate::IP->new;
if($validator->is_ipv4($ip))
{
print "Yep, $ip is a valid IPv4 address.\n";
}
else
{
print "Nope, $ip is not a valid IPv4 address.\n";
}
输出是:
Yep, 216.108.225.236 is a valid IPv4 address.
用逗号替换破折号。
/(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\:\d{1,5})/
虽然在 CPAN 有很好的文档和测试模块来匹配和验证 IP 地址,但你必须有充分的理由不使用它。就我个人而言,我从来没有真正的理由将它们用于验证目的,因为我信任/提供了输入。
这是您的正则表达式的较短版本,它有自己的缺陷:
while (my $ip = <DATA>) {
chomp $ip;
# older version
# if($ip =~ /(\d{1-3}\.\d{1-3}\.\d{1-3}\.\d{1-3}\:\d{1-5})/)
# see below for explanation
if ($ip =~ /\b(\d{1,3}(?:\.\d{1,3}){3}:\d{1,5})\b/)
{
print "$ip - matches\n";
} else {
print "$ip - does not match\n";
}
}
__DATA__
216.108.225.236:60099
4.2.2.1:1
216.108.225.236:0
1216.1108.1225.1236:1234
216.108.225.236x:123
9216.108.225.236:8472
10.10.10.10
结果:
216.108.225.236:60099 - matches
4.2.2.1:1 - matches
216.108.225.236:0 - matches
1216.1108.1225.1236:1234 - does not match
216.108.225.236x:123 - does not match
9216.108.225.236:8472 - does not match
10.10.10.10 - does not match
解释:
/\b # word boundary
( # start memory capture group 1
\d{1,3} # one to three digits, first octat
(:? # start non memory capture group, notice ?:
\.\d{1,3} # a literal dot followed by an ip octet
) # end non memory capture group
{3} # three times of dots and ip octets
: # match a colon
\d{1,5} # port number, one to five digits
) # end of memory capture group 1
\b # word boundary
希望这可以帮助。
这可能会有所帮助:
my $ip = "195.249.61.14";
my @ips = (
"set protocols bgp group IBGP-RRCL-CUSTOMER neighbor 195.249.61.142",
"set protocols bgp group IBGP-RRCL-CUSTOMER neighbor 195.249.61.14",
"set protocols bgp group IBGP-RRCL-CUSTOMER neighbor 195.249.61.141"
);
foreach (@ips) {
print "$_\n" if ( /\b$ip\b/ );
}
输出:
set protocols bgp group IBGP-RRCL-CUSTOMER neighbor 195.249.61.14
#!/usr/bin/perl
$str = 'IP address is : 70.21.311.105';
if ($str =~ m/(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})/) {
if ($1 <= 255 && $2 <= 255 && $3 <= 255 && $4 <= 255 ) {
print "Valid $str\n";
} else {
print "invalid IP $str\n";
}
}
__END__
试试这个:
$variablename=~m/((((0-9)|((1-9)(0-9))|(1([0-9]){2})|(2[0-4][0-9])|(2[5][0-5]))\.){3})((0-9)|((1-9)(0-9))|(1([0-9]){2})|(2[0-4][0-9])|(25[0-5]))/)
use strict;
use warnings;
open(FH,"<fileName.txt") or die "file not found ,$_";
while(my $line=<FH>)
{
push(my @arr,($line));
foreach my $arrVal (@arr)
{
if($arrVal=~/IPv4 Address(?=.*\b((25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2 [0-4]\d|[0-1]?\d?\d)){3})\b)/)
{
print "$arrVal\n";
}
}
您还可以使用以下正则表达式来确保四边形不大于 255,它还“重用”数字匹配而不是复制粘贴 4 次。
my $rx = qr/^(?!(\.))(\.?(\d{1,3})(?(?{$^N > 255})(*FAIL))){4}$/;
if('192.168.1.2' =~ $rx){
print "OK\n";
}
它使用了 perl 正则表达式匹配(man perlre)的一些特性:
$ip = "10.255.256.1";
# will accept valid ips
if ($ip =~ m/^([1|2][0-9]{1,2})\.([0-255]{1,3}\.){2}[0-255]{1,3}/ && ($1 <=255)) {
print "This is a valid ip: $ip \n";
} else {
print "This is not a valid ip: $ip \n";
}