Only letters and numbers

[Sami]

Hi.Is there a way I can validate that a string only contains letters and numbers?

[Ingolme]

It uses regular expressions.Just search for any character that's not a letter or number.

$str = 'A string';if(!preg_match('/[^a-zA-Z0-9]/',$str)) {  // This string is valid} else {  // This string is not valid}

Regular expressions may be complicated to understand at first. Check http://regularexpressions.info and PHP's manual: http://php.net/preg_match

[Sami]

It uses regular expressions.Just search for any character that's not a letter or number.

$str = 'A string';if(!preg_match('/[^a-zA-Z0-9]/',$str)) {  // This string is valid} else {  // This string is not valid}

Regular expressions may be complicated to understand at first. Check http://regularexpressions.info and PHP's manual: http://php.net/preg_match

Thanks! But can I make 'æ', 'ø' and 'å' valid using that code? Forgot to mention that x)

[Ingolme]

Yes, you just need to add them to the regular expression. /[^a-zA-Z0-9æøå]/Character encoding might be a problem, though, you can use the unicode number of the character like this:/[^a-zA-Z0-9\u####\u####\u####]/Substitutung the # for the character number.

[Sami]

Yes, you just need to add them to the regular expression. /[^a-zA-Z0-9æøå]/Character encoding might be a problem, though, you can use the unicode number of the character like this:/[^a-zA-Z0-9\u####\u####\u####]/Substitutung the # for the character number.

I guess this character encoding problem gone if I use UTF-8 ?It doesn't work btw. Everything becomes invalid.