Re: [PHP] check for alphanumeric characters
* John Nichel <[EMAIL PROTECTED]>:
> Diana Castillo wrote:
> > what kind of a function can I use that will tell me whether a variable is
> > alphanumeric (that is has only characters A-Z or 1-9 )?
>
> Something like this should work. (untested)
>
> preg_match ( "/^([a-z]||[A-Z]||[0-9])+$/", $string )
It can be simpler than that, actually:
preg_match('/^[a-z0-9]+$/i', $string)
(tested and works)
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Re: [PHP] check for alphanumeric characters
Philip Hallstrom wrote:
what kind of a function can I use that will tell me whether a variable is
alphanumeric (that is has only characters A-Z or 1-9 )?
http://us3.php.net/manual/en/function.ctype-alnum.php
bool ctype_alnum ( string text )
Checks if all of the characters in the provided string, text, are
alphanumeric. In the standard C locale letters are just [A-Za-z] and the
function is equivalent to preg_match('/^[a-z0-9]*$/i', $text).
Returns TRUE if every character in text is either a letter or a digit,
FALSE otherwise.
Note that if you pass in an empty string you'll also get TRUE...
I always forget about the c_type functions. Good call.
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John C. Nichel
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716.856.9675
[EMAIL PROTECTED]
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Re: [PHP] check for alphanumeric characters
what kind of a function can I use that will tell me whether a variable is
alphanumeric (that is has only characters A-Z or 1-9 )?
http://us3.php.net/manual/en/function.ctype-alnum.php
bool ctype_alnum ( string text )
Checks if all of the characters in the provided string, text, are
alphanumeric. In the standard C locale letters are just [A-Za-z] and the
function is equivalent to preg_match('/^[a-z0-9]*$/i', $text).
Returns TRUE if every character in text is either a letter or a digit,
FALSE otherwise.
Note that if you pass in an empty string you'll also get TRUE...
-philip
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Re: [PHP] check for alphanumeric characters
Diana Castillo wrote: what kind of a function can I use that will tell me whether a variable is alphanumeric (that is has only characters A-Z or 1-9 )? Something like this should work. (untested) preg_match ( "/^([a-z]||[A-Z]||[0-9])+$/", $string ) -- John C. Nichel ÜberGeek KegWorks.com 716.856.9675 [EMAIL PROTECTED] -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] check for alphanumeric characters
[snip] what kind of a function can I use that will tell me whether a variable is alphanumeric (that is has only characters A-Z or 1-9 )? [/snip] You can use a regular expression, start here http://us3.php.net/regex -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
