PHP detect uppercase and length of the word

[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

[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)