speicific preg_match help pls?

[woolyg]

Hi all,

 

I'm looking to disallow all characters except the following from a form's text field:

 

1 2 3 4 5 6 7 8 9 0 W L D

 

Can anyone help me with the preg_match?

 

WoolyG

[btherl]

Here's how I would do it

 

 if (preg_match('|^[0-9WLD]+$|', $input)) {
  # Validated
} else {
  # Failed validation
}

 

The above requires at least 1 character to be present to be valid.  If you use "*" instead of "+" then it will allow 0 characters to be valid as well.

[woolyg]

That's great, thanks. There'll always be at least 1 character being entered, so I'll use what you printed!

 

Nice one, thanks again - WoolyG

[woolyg]

An addition to my query:

 

Say if I wanted to invalidate $input if preg_match had BOTH numerals and characters (W/L/D) in it, how would I go about that?

 

Cheers,

WoolyG

[effigy]

This will match only digits or characters: /^(?:\d+|[WLD]+)$/

[woolyg]

I'm trying to invalidate an entry that uses numerals and any of the characters D/W/L. Would this work, below?

 

<?php
if( (preg_match('|^[WLD]+$|', $input)) && (preg_match('|^[WLD]+$|', $input)) ) { 

// Invalidate $input

}
?>

 

.. is the code above ok? That is, if $input had number(s) in its string, and had W/L/D in its string, it's invalid?

 

Cheers,

WoolyG

[btherl]

What effigy wrote is what you're looking for.  His regexp translates to "$input contains only digits or $input contains only WLD".  So it will not validate an $input that contains both WLD and digits.  Basically it does everything all in one, validation of WLD *or* digits, as well as invalidation of anything else.

[woolyg]

OK, thanks for that - WoolyG