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PHP RegEx

Using preg_match_all()

4

<?php
// define string
$str = "The rain in SPAIN falls mainly on the plains.";

// do a case-insensitive count of the number of occurrences of "ain" in a string
$pattern = "/ain/i";

// display the number of times the results of the search are found or "0" for none
echo preg_match_all($pattern, $str);
?>