$re = '/<img.*?src="([^"]+)".*?>/';
$str = '<img src="http://192.168.1.200/wpdev/wp-content/uploads/2017/12/63725-toxic-sign-300x300.png" alt="" width="25" height="25" class="alignnone size-medium wp-image-5" /><img alt="" src="http://192.168.1.200/wpdev/wp-content/uploads/2017/12/pre-loader.gif" width="25" height="25" class="alignnone size-full wp-image-4" /> <i class="fa fa-motorcycle"></i> Kawasaki';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php