Help in checking value patterns

[elioncho]

Hi. I need to check if a value is written correctly by the user. The value consists of numbers from 1-9 and two decimal places (optional). How can I write a pattern check for this? Thanks...

[Caesar]

[code]
<?php

$string = $_POST[usr_input];

if(!preg_match('/[0-9]+.?[0-9]+?/',$string)) {

echo'You done messed up, son';
}

else {echo'That\'s the thing there';}

?>
[/code]

[elioncho]

thanks!!! :D thank you very much