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  1. <?php
  2.  
  3. // your code goes here
  4. $file_content='blah blah onClick="rpd(56)"; blah blah\nblah blah onClick="rpd(43)"; blah blah\nblah blah onClick="rpd(11)"; blah blah\n';
  5. //$file_content = file_get_contents($url);    
  6. $pattern= '/onClick="rpd\((\d+)\)";/';
  7. preg_match_all($pattern, $file_content, $matches);
  8. print_r($matches);
Success #stdin #stdout 0.01s 20520KB
comments (?)
stdin 
Standard input is empty
stdout 
Array
(
    [0] => Array
        (
            [0] => onClick="rpd(56)";
            [1] => onClick="rpd(43)";
            [2] => onClick="rpd(11)";
        )

    [1] => Array
        (
            [0] => 56
            [1] => 43
            [2] => 11
        )

)
https://ideone.com/TzShPG
language:
PHP (php 7.3.5)
created:
12 years ago
visibility:
secret

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