[PHP] form validation

[al phillips]

I''ve tried !preg_match and !eregi to validate my form. I get back whatever the 
user inputs into the textboxes. I would like to validate each textbox before 
submitting and redirect the user after submission?  Here's part of the code
   
  <?php // Script 1 handle .html
 // Should accept First & Last Name email address phone city state
// Validate input from textfields
  
if (!preg_match("/[^a-zA-Z\.\-\Ä\ä\Ö\ö\Ü\ü\
   ]+$/s",$firstname)); {
 print '<p>Please enter Letters from A to Z</p>';
 }

 
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