preg_replace

[Arc]

I need to replace everything in a number except for the numbers and decimals. For instance, if I have $123,qwe234,sdf454.wer45 I would end up with 123234454.45. I am not up on ho to use preg_replace enough to do this... anyone know how?

Thanks!😃

[laserlight]

You could avoid using perg_replace with say:

$str = '$123,qwe234,sdf454.wer45';
$len = strlen($str);
$temp = '';
for ($i = 0; $i < $len; $i++) {
	if (ctype_digit($str{$i}) || $str{$i} == '.')
		$temp .= $str{$i};
}
$str = $temp;

Or if you insist:

$str = preg_replace('/[^0-9\.]/', '', $str);

Though regular expressions are often slower then customised solutions.

Of course, if you define what you want more clearly (e.g. a numeric string with the decimal point in a syntatically correct position), then regular expressions become the obvious choice.