php - Get IP address in a string -

i'm looking sort of php-code scan /var/log/secure filter breakin attempts. below examples of strings need searched , ip address only. i'm using 0.0.0.0 example of ip address , not actual ip.

failed password invalid user admin 0.0.0.0 port 3108  invalid user ubnt 0.0.0.0 pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=0.0.0.0 

with additional information provided op in this comment, decided redo answer. so;

$file=file_get_contents("/var/log/secure"); $lines=explode("\n",$file); $accepted=array(); $fail=array(); $r="/(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)/"; foreach($lines $line){   //try ip   $t=array();   preg_match($r,$line,$t);   $ip=$t[0];   if(strpos($line,"accepted password")!==false){     //successfull login     $accepted[]=$ip;   }   else{     //failed login attempt     $fail[]=$ip;   } } 

now $accepted contains ip's logged in successfully, , $fail did not.

i hope helps you.