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  1. <?php
  2.  
  3. $data = "from remote.intra.domain.net (sbs-2011.intra.local [0.0.0.0]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by mailhost.domain.net (Postfix) with ESMTPS id A2E067029D9 for <john.doe@domain.net>";
  4.  
  5. function extractComments($data)
  6. {
  7.     $comments      = [];
  8.     $index         = null;
  9.     $parensCounter = 0;
  10.  
  11.     foreach(str_split($data) as $char)
  12.     {
  13.         if($char == '(' && !isset($index))
  14.         {
  15.             $index = count($comments);
  16.             $comments[$index] = '';
  17.         }
  18.         else if($char == '(')
  19.         {
  20.             $parensCounter++;
  21.             $comments[$index] .= $char;
  22.         }
  23.         else if($char == ')' && $parensCounter != 0)
  24.         {
  25.             $parensCounter--;
  26.             $comments[$index] .= $char;
  27.         }
  28.         else if($char == ')')
  29.         {
  30.             $parensCounter = 0;
  31.             $index = null;
  32.         }
  33.         else if(isset($index))
  34.         {
  35.             $comments[$index] .= $char;
  36.         }
  37.     }
  38.  
  39.     return $comments;
  40. }
  41.  
  42. function extractDomain($data)
  43. {
  44.     $matches = [];
  45.  
  46.     preg_match('#from\s(.+)\s+#U', $data, $matches);
  47.  
  48.     return $matches[1];
  49. }
  50.  
  51. var_dump(array_merge([extractDomain($data)], extractComments($data)));
Success #stdin #stdout 0.01s 24144KB
comments (?)
stdin 
Standard input is empty
stdout 
array(5) {
  [0]=>
  string(23) "remote.intra.domain.net"
  [1]=>
  string(30) "sbs-2011.intra.local [0.0.0.0]"
  [2]=>
  string(49) "using TLSv1 with cipher AES128-SHA (128/128 bits)"
  [3]=>
  string(31) "No client certificate requested"
  [4]=>
  string(7) "Postfix"
}
https://ideone.com/3SLrPZ
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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