A-Z and 0-9

[michalopek100]

how to pass values of variables which contain only characters A-Z and 0-9 and nothing more. I' m looking for an easy and simply code
thx

[ednark]

we are all looking for easy and simple code

• assumption

  you have a form... and a form value that can only contain A-Z and 0-9

• solution method

  use regular expressions to do the check....

• solution application

  1) use javascript:

  im a bit rusty on this.. so the onSubmit part may be slightly off... but i think you have it return true or false.. and then the form either submits on true or doesn't submit on false

  <script langugae="javascript">
  function validateThisForm( form )
  {
      var regex = new RegExp("/^[A-Z0-9]+$/");
      if( regex.test(form.fieldToCheck) ) {
          return true;
      }
      alert( 'your value is not A-Z 0-9: fix it' );
      return false;
  }
  </script>
  
  <form onSubmit="javascript:return validateThisForm(this)">
      <input type="text" name="fieldToCheck">
  </form>
  

  2) use php: this has to be done anyways.. as the persons browser may not use or may have turned off javascript...

      if ( !isset($_POST['fieldToCheck']) ) {
          /// must return to form, value not found
      }
  
     $pregex = "/^[A-Z0-9]+$/";
  
     if ( !preg_match( $pregex, $_POST['fieldToCheck'] ) ) {
       /// must return to form, field is not valid
     }
  
  

[planetsim]

<form onSubmit="java script:return validateThisForm(this)">

try this

<form onsubmit="return validateThisForm(this)">
you dont actually need the javascript..

also btw dont have a space in the java script its javascript.. But i can see your rusty at it

[michalopek100]

maybe you will show me sth in php - I don't want to use javascript in this case - I have to be absolutely sure that there won't be any other characters passed with or without Javascript (sb can have it turned of on local comp)
thx for this srcipt I,m waiting for another

[planetsim]

If Javascript misses something you should always have PHP behind it to make sure it didnt miss anything.

[michalopek100]

ok I haven' read the second part in php (I missed it)
thx, sorry