I want to allow characters like & and = but I seem to not be able to get it right. Is the below correct if I want to allow a string between 5-50 characters with special characters like (_.?&=)?

[A-Za-z0-9_.?&=]{5,50}

    You probably want to anchor the start ("") and end ("$") of the string:

    $preg_match('/^[A-Za-z0-9_.?&=]{5,50}$/', $string);

      Found out what the problem was. Forgot that when I was filtering I used htmlentities and forgot to decode it.

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