php grep?

[sgray]

Hi Guys,

I have an array assigned to $data (line of text), I'm wishing to search within the array for any lines which match a certain IP, ie 192.168.x.x. What is the command that enables me to search every $data value for the text, and return the results in the form of a new array such as $data_matches. I'm not fussed about the lines which do not contain the ip's so these can be discarded. The command, and an example would be well appreciated.

I've had a look into some of the preg commands but these seems to return true or false values rather than the whole line the text is contained within.

thanks in advance,

Stewart

[NogDog]

Have you looked at [man]preg_grep/man yet?

[sgray]

I had, however your reply prompted me to re investigate. Some tinkering with some regex stuff has it working well. Thanks mate 🙂

[sgray]

Now I've got an array containing the IP's I'm after, how would I parse that array to show only the IP's. The are delimitered with {}'s, ie {192.168.0.5}. I'm really just after the command to do this, I'm happy to go tinker with it 🙂

I imagine I'd use a 'for each' loop to go through each line of the array.

[NogDog]

You could use [man]array_map/man, something like this:

<?php
// test data:
$data = array(
   "This is {12.34.56.78} a test.",
   "It is only {1.234.56.7} a test."
);
// callback function for array_map():
function ip_only($value)
{
   if(preg_match('/(?<=\{)(\d{1,3}\.){3}\d{1,3}(?=\})/', $value, $matches))
   {
      return($matches[0]);
   }
   return '';
}
// do it:
$data = array_map('ip_only', $data);
// show result:
printf("<pre>%s</pre>\n", print_r($data, 1));
?>

[sgray]

thanks, would something like the following work as well?

where $lines is the array containing the lines with text and ip's

foreach($lines as $ips) {
preg_match('/(?<={)(\d{1,3}.){3}\d{1,3}(?=})/', $ips, $matches))
}
print_r($matches)

If you hadnt figured already, I'm making a script to parse some log files. There will be 500,000 of lines of text. Is PHP going to be good for this job or would I be best off to use something else such as Perl or even bash? I'm wondering how it's going to handle having that huge file loaded to memory with the file() command.

[NogDog]

That would overwrite the $matches array on each iteration of the loop. You could do:

$ips = array();
foreach($lines as $ips) {
   preg_match('/(?<=\{)(\d{1,3}\.){3}\d{1,3}(?=\})/', $ips, $matches));
   $ips[] = $matches[0];
}
print_r($ips);