[Regex] Only positive integer without sign with max length

whisher06

Hi.
I'm not very comfy with regEx therefore
I ask your help :

function isNumeric($num){
return (bool)preg_match('/^{[1-9]\d{0,9}$/',$num);}
}
var_dump(isNumeric("1234567891"));//true
var_dump(isNumeric("1234567891"));//true
var_dump(isNumeric("12345678910"));//false
var_dump(isNumeric("0"));//false
var_dump(isNumeric("-1111"));//false
var_dump(isNumeric("-1111"));//false
var_dump(isNumeric("+11"));//false
var_dump(isNumeric("faii"));//false

It seems to work but :o

Bye.

NogDog

You could simplify the regex a bit to:

'/^\d{1,10}$/'

whisher06

NogDog wrote:
You could simplify the regex a bit to:
'/^\d{1,10}$/'

Thanks a lot for the ready reply
but I need a match only for
the positive integer 😉

function isNumeric($num){
return (bool)preg_match('/^{\d{1,10}$/',$num);}
}
var_dump(isNumeric("0"));//true

Bye.

NogDog

Ahh, I see. I was thinking of "positive integer" as "non-negative integer".

Your regex should work fine. It might be interesting to test whether your preg_match() exectues faster/slower than something like:

if(ctype_digit($num) && $num) {

laserlight

<< deleted >>

whisher06

NogDog wrote:
Ahh, I see. I was thinking of "positive integer" as "non-negative integer".

Your regex should work fine. It might be interesting to test whether your preg_match() exectues faster/slower than something like:
if(ctype_digit($num) && $num) {

Thanks for the piece of advice.
It works quite well

function isNumeric($num){
	return (ctype_digit($num) && !empty($num));
}
var_dump(isNumeric('5'));//true
var_dump(isNumeric(''));//false
var_dump(isNumeric('0'));//false
var_dump(isNumeric('01'));//true ;(
var_dump(isNumeric('0001'));//true ;( ;( ;(

Because I must use the method to check
a GET value I must take into account which
way is faster/slower.

Bye.