html text field validation via php -

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i have html form , want validate fields until user insert correct details. current code not validating form.

my code:

ex 

<html> <body>  <form method ="post" > <label>company*</label> <br/> <input type="text" name="company" class="form-control" style="width:40%" required data-parsley-minlength="10"> <label>address*</label> <br/> <textarea class="form-control" name="address" rows="3"style="width:40%;resize:none"  required ></textarea> <label>website(url)</label><br/> <input type="text" name="url" class="form-control" style="width:40%"> <label>key contact person*</label> <br/> <input type="text" name="contact" class="form-control" style="width:40%" required> <label>email</label> <br/> <input type="text" name="email" class="form-control" style="width:40%"  pattern="^\w+([.-]?\w+)*@\w+([.-]?\w+)*(.\w{2,3})+$">  </form>  </body> </html>

i want string value email validation unfortunately not working.

php validation: 

if(isset($_post['register']))     {         if($company == "" && $address =="" && $url =="" && $contact =="" && $email =="" && $requirements=="")          {              $alert = '<script> bootbox.alert("please fill form correctly.")</script>';          }          else          {               if($company !=="" || $address !=="")               {                  $alert = '<script> bootbox.alert("please fill form correctly.")</script>';                 }            }          $company = $_post['company']."\n";         $address = $_post['address']."\n";         $url     = $_post['url']."\n";         $contact = $_post['contact']."\n";         $email= $_post['email']."\n";          $msg =  'company name: '.$company;         $msg.=  'address: '.$address;         $msg.=  'url: '.$address;         $msg.=  'contact: '.$contact;         $msg.=  'email: '.$email;              } ?>

first of trying validate $_post['register'] not part of html code. might wanna give form name . , think it's best if validate code javascript (preferably jquery) @ client side level first.

check if fields $_post['email'] set , see if content empty.

you have tell form script take care of form.

if php code in separate file,

<form action="my_validator.php" method="post">

or else,

<form action="<?php echo $_server['php_self']; ?>" method="post">

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