PHP detect uppercase and length of the word

[auriaks]

Hi,

How I can detect the length of variable value?
Also I want to check the same variable for Uppercase letters. If they are - script tells me.

Thanks in Advance :)

[Schmoopy]

<?php
$str = "contains UpperCASE";

$len = strlen($str);

$pattern = preg_match('/[A-Z]+/', $str);

if($pattern)
echo 'Uppercase Detected';

?>

To find the string length, just simply use strlen() around the variable, as above. $len is equal to 18 in this example.

I'm terrible at regex, but the above pattern seems to do the job.

[djr33]

I'm not sure what your purpose is, but you can also use strtolower() or strtoupper() to convert to all upper/lowercase and then you don't have to worry about inconsistencies if you are checking for that reason.

[BLiZZaRD]

I'm not sure what your purpose is..

Always assume it's malicious! :D

[james438]

Almost always when I see a request for this it is to confirm whether a complex password was submitted; one that has upper and lowercase letters and numbers.

[djr33]

If that, then you can confirm it in this way:
if ($p!=strtolower($p)&&$p!=strtoupper($p)) { ...complex... }

[traq]

^umm... ?

do you mean
<?php
$str = 'UPPERCASE & lowercase';
if(preg_match('/[A-Z]+/', $str) && preg_match('/[a-z]+/', $str)){ /* all is well */ }
?>?

[djr33]

If the goal is to see if there are BOTH lowercase and uppercase, then using the two functions in my post above will work-- basically you're checking that it's already not all lowercase and not all uppercase.

What you're doing could never return true, I believe. (Though I'm no good with regex either.)

[auriaks]

Thanks, for all the information.

The aim is to check if word is without uppercases :D

[djr33]

Without uppercases?
Do this:
if ($p==strtolower($p)) { ...it's ok... }

Or, you can just do this:
$p = strtolower($p);

[james438]

If ever you can script without using PCRE (Perl Compatible Regular Expressions) you should do so since PCRE uses a lot of processor resources. As I recall, Perl has an engine specifically designed for regex and is not processor heavy.

[auriaks]

It is done with this one... can someone take a look to this?? HERE (http://www.dynamicdrive.com/forums/showthread.php?t=53535)

[traq]

If the goal is to see if there are BOTH lowercase and uppercase, then using the two functions in my post above will work-- basically you're checking that it's already not all lowercase and not all uppercase.

What you're doing could never return true, I believe. (Though I'm no good with regex either.)

I see what you're doing now - yes, you're right. I was misreading the syntax.

I think my solution would work as well, though I haven't tried it. I'll let you know.

[djr33]

Ah, and I think I was reading yours wrong.

Does the function check for ANY matches or a complete match from the whole string?
You're saying "exists [uppercase] and exists [lowercase]", not "[whole string is upper] and [whole string is lower]".

I read it the second way when I first saw your post.


In other words, preg_match returns TRUE upon finding a match, rather than returning FALSE upon finding a non-match.



Yes, that would work, but personally I'd prefer the more "human readable" string functions (when they work, of course-- sometimes regex is needed/easier).

[traq]

Exactly. [A-Z] is the character range we're searching for, and + means "one or more of".

Using functions might be quicker, since regex can be more process-intensive, but with the (likely small) size of our $string, I don't think it would be an issue. I think it would improve the speed of the regex if I combined them into a single pattern, too, instead of checking twice.

[djr33]

I'm not sure you would be able to combine them together in the sense that you are checking if (1) and if (2), not if (1/2).
My motivation for using string functions is simply that they are easier (for me). Regex likely is a bit slower, but using it can be more standardized if you are doing a lot of checks for lots of different patterns and it can also do a lot that string functions can't.

[traq]

this works. true for UPPER and lowercase, but not UPPER or lowercase:
preg_match('/(?=.*[A-Z])(?=.*[a-z])/', $str)