php check if string contains some letters/numbers

Question

I have some string in which I would like to check if contains some letters or numbers. Those letters are from a-z, A-Z and all numbers.

So this is the example: $goodstring = "abcdefg%$#%&asdqwe"; $badstring = "%$#&%#/&/#$%!#-.";

check if $goodstring contains letters/numbers and if, then return true. check if $badstring contains letters/numbers and if not, then return false.

I have also used preg_match, but this works only if there are not some letters/numbers in string.

you want to check if the string contains only letters a-z, A-Z and numbers or you want to check if it contains at least one of those? — Ivaylo Strandjev, Apr 20 '12 at 07:44
**I have also used preg_match**. You might've done it wrong. Why not share what you tried? — Nanne, Apr 20 '12 at 07:46
I want check if contains any letter/number - it's not important if there is one or more, just shouldn't contains characters %$#!& I tried this, but don't work good: preg_match("/^([a-zA-Z0-9])+$/i", $badstring) — user1257255, Apr 20 '12 at 07:46
@user1257255 so you want to check if it contains ONLY alphanumerics? — Ivaylo Strandjev, Apr 20 '12 at 07:53

score 2 · Accepted Answer · answered Apr 20 '12 at 07:53

2

Here you go ("only" version):

$containsOnlyLettersOrNumbers = (preg_match('~^[0-9a-z]+$~i', $string) > 0);

Or (depending on what you want exactly):

$containsLettersOrNumbers = (preg_match('~[0-9a-z]~i', $string) > 0);

answered Apr 20 '12 at 07:53

Alix Axel

score -1 · Answer 2 · answered Apr 20 '12 at 07:56

-1

var_dump(preg_match('#[0-9]|[a-z]#i', $goodstring));
var_dump(preg_match('#[0-9]|[a-z]#i', $badstring));

answered Apr 20 '12 at 07:56

s.webbandit

2 Answers2