Hi there, am new to website design and fighting with an error message which I am not sure how to resolve. Can anyone offer any help on this please. Thank you
"Warning: preg_replace(): Unknown modifier '<' in /usr/www/users/datatrf/feedback_form.php on line 13"

    Adding to above, my line 13 looks like this:
    return preg_replace('/[nr|!/<>^$%*&]+/','',$form_field);

      You need a \ before the literal / in your regex so that it is not interpreted as the end-of-pattern indicator.

      PS: Or you could change the opening and closing / pattern delimiters to some other acceptable character, e.g.:

      preg_replace('#[nr|!/<>^$%*&]+#', '', $form_field);
      
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