kalinichenkoroman

<?php
$field_name = "text_field";
$field = get_field_object($field_name);

echo $field['label'] . ': ' . $field['value'];

$pattern = '/[\w.%+-]+@(?:[a-z\d-]+\.)+[a-z]{2,}|\[mailto:[^\]]+(*SKIP)(*F)/i';

$str = preg_replace($pattern, '[mailto:$0]', $str);