Preg match

[Tandem]

Could anyone demonstrate to me a preg match that detects if the subject contains only spaces?

I can't work it out myself.

Thanks for any help.

[effigy]

[code]
<pre>
<?php

$string = '    ';
echo 'All spaces? ';
echo preg_match('/^\x20+$/', $string) ? 'Yes' : 'No' ;

?>
</pre>
[/code]

If you're looking for blank lines, change the + to *, and \x20 to \s. \s is more commonly used to represent any kind of whitespace, not only spaces.

[Tandem]

Works perfectly, thank you very much.