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Editorial Team
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Asked: 2026-05-26T06:48:51+00:00

I have this current code that allows me to check the users first name

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I have this current code that allows me to check the users first name from a registration form to ensure it only contains letters, spaces and dashes. However how can I enable checking multiple fields (e.g. last name too).

/* Checks if the first name only includes letters, dashes or spaces */
   if(preg_match("/^[a-zA-Z -]+$/", $_POST['firstname']) == 0)
        $errors .="Your name must only include letters, dashes, or spaces.";

I’ve tried the following but it seems to only check one or the other, not both.

  if(preg_match("/^[a-zA-Z -]+$/", $_POST['firstname'], $_POST['lastname']) == 0)

and also:

if(preg_match("/^[a-zA-Z -]+$/", $_POST['firstname'] and $_POST['lastname']) == 0)

Thanks in advance for any suggestions.

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1 Answer

  1. Editorial Team

    Since both of the fields are going to be validated with the same regex and you don’t want to return any specific feedback about which one, if any, fails you can simply concatenate the two strings. 

    if(preg_match("/^[a-zA-Z -]+$/", $_POST['firstname'] . $_POST['lastname']) == 0)
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