PHP preg_split IPs in a string

Question

I am trying to use preg_split in PHP to break up the following string and return me the 2 ip addresses:

$membersStr = "members { 167.69.27.151:4449 {} 167.69.27.153:4449 {} 167.69.27.154:4449 { session user disabled } 167.67.27.156:4449 }";

My code is:

$nodesArray = preg_split("/\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b/", $membersStr, -1, PREG_SPLIT_NO_EMPTY);

then simply print it for now:

print_r($nodesArray);

However it is an empty array. I double checked my regular expression from an online checker and it returns the IP.

Trying :

preg_match_all('/\d+\.\d+\.\d+\.\d+/', $membersStr, $nodesArray);
echo $nodesArray[0];

Prints:

Array

In my browser.

Chris Laplante · Answer 1 · 2011-02-21T20:31:36.333

2

You don't need that complex of a Regex here. Use this Regex to pluck out the IPs inside the first set of brackets:

members \{(.*)\}

Take the first group (what is between the parentheses). Then explode() on {} to get each IP. Iterate over each value, trim it, and make sure it isn't blank.

Edit

Try this:

$membersStr = "members { 167.69.27.151:4449 {} 167.69.27.153:4449 {} }";

$ips = explode("{", $membersStr, 2);
$ips = explode("{}", $ips[1]);

foreach ($ips as $ip){
    $ip = trim($ip);
    if ($ip != "" && $ip != "}")
        echo $ip . "<br/>";
}

SAMPLE PULLED FROM FILE

 members {
      167.69.97.48:4440 {
         session user disabled
      }
      167.69.97.91:4440 {}
   }

Edit

Use the other answer, but like this:

$membersStr = @" members {
      167.69.97.48:4440 {
         session user disabled
      }
      167.69.97.91:4440 {}
   }";

preg_match_all('/\d+\.\d+\.\d+\.\d+/', $membersStr, $nodesArray);

foreach ($nodesArray[0] as $ip)
    echo $ip . "<br/>";

edited Feb 21 '11 at 20:31

answered Feb 21 '11 at 19:34

Chris Laplante

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Let me work up some example code for you, and then you can try it – Chris Laplante Feb 21 '11 at 19:38
What version of PHP are you using? – Chris Laplante Feb 21 '11 at 19:56
My membersStr is grabbed from a file with newlines in it..do you think this would cause that error? – Jim Feb 21 '11 at 19:59
It might. Can you post an exact copy of a sample membersStr, including new lines? – Chris Laplante Feb 21 '11 at 20:00
It's complaining about this line $ips = explode("{}", $ips[1]); – Jim Feb 21 '11 at 20:10
I am using file_get_contents to populate $membersStr . Is that the issue? – Jim Feb 21 '11 at 20:44
It won't matter how you are getting the data. What version of PHP are you using? – Chris Laplante Feb 22 '11 at 20:57

score 0 · Answer 2 · answered Feb 21 '11 at 19:42

If you use your existing regular expression for splitting, then the matched part will certainly not part of the result list. Instead you'll get the empty space and fill stuff in between.

Therefore it's simpler if you match and extract the parts that you actually want:

preg_match_all('/\d+\.\d+\.\d+\.\d+/', $str, $matches);
$list = $matches[0];

PHP preg_split IPs in a string

2 Answers2

SAMPLE PULLED FROM FILE