[RESOLVED] Determine if a string contains numbers or not

nca

How would I write a php code line that would determine if a string contains any numbers (0-9)?

dagon

$str ='sdfsdrtreteqtqe7gsdfwevtertq';

if (preg_match('#[0-9]#',$str)){

echo 'has number';
}else{
	echo 'no number';

}

nca

great thank you!

scrupul0us

also acceptable?

...
preg_match('#[\d]#',$str)
...

bradgrafelman

No need for the []'s in that example, but yes, \d translates to [0-9], so it would be an equivalent solution.

nrg_alpha

scrupul0s, \d is already a short hand character class for [0-9]. So as Brad mentioned, no need for []. However, there is one caveat... depending on your locale, \d might also accept exponents.. (I'm going to hazzard a guess that the odds of running into exponents is slim to none (much like my chances of winning the lottery)).

But to be sure, if using character class shorthands like \d, you can set your LC_CTYPE to 'C' prior to any regex like so:

setlocale(LC_CTYPE, 'C');

Likewise, this also applies to \w. Typically, that shorthand character class is viewed as pretty much the equivalent to [a-zA-Z0-9], but again, depending on your locale, this class might also include exponents and accented characters as well. So by setting LC_CTYPE, those issues are eliminated (as in, \d will in fact only check for [0-9] while \w will only check for [a-zA-Z0-9]). All of this also applies to stuff like ctype_digit(), ctype_alnum(), etc...

scrupul0us

wow, ask a question and get a wealth of knowledgeable info in return

thanks guys 😃