[SOLVED] Code Explanation please ??

[ali_2kool2002]

Hi  can someone explain how the code works so at least i know how php does it instead of just using it from here

the first code checks if there are no numbers in the text field for name but what do those characters in preg match mean same applies for how does the email validation work? Thanks for anyone to crack this cheers :

 

if ( !preg_match('/^[a-zA-Z\" "]*$/', $yname) ) 
   {      
    error('Name is not Valid.\\n'.
            'Please try again.');
      }Repeat it for every text box u want to validate.

Use this for email validation:

Code:
if (!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})$", $yemail)){ 
  error("Invalid e-mail address");
}

[keeB]

Those are called Regular Expressions (regex for short.) They're a pain in the butt to learn!

[taith]

[_a-z0-9-] --> any letters, a-z, or numbers 0-9

(\.[_a-z0-9-]+) --> followed by a maybe a "." , and any letters/numbers

@[a-z0-9-] --> an @ symbol, followed by any letters/numbers

(\.[a-z0-9-]+) --> followed by maybe a ".", and any letters/numbers

(\.[a-z]{2,4}) --> followed by a dot, and any letters/numbers, thats between 2-4 characters long

if (!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})$", $yemail)){ 
  error("Invalid e-mail address");
}

 

if that helps any...