What's the expression for alpha numeric?

[aeroswat]

I need to only allow my string to have a combination of the following 0-9 and A-Z. So far I have this which gives me only 0-9

 

preg_replace("/[^0-9]/", "", $bookISBN)

[JonnoTheDev]

[A-Z0-9]+

[JAY6390]

/[^0-9a-z]/i

@neil - your A-z will allow all characters between Z and a in the ASCII table too

[aeroswat]

/[^0-9a-z]/i

@neil - your A-z will allow all characters between Z and a in the ASCII table too

 

I think there are no characters between cap A and cap Z on the ASCII table? And I need it to be able to recognize both lowercase and uppercase if that makes a difference.

[JAY6390]

My regex does...and yes there are (between capital A and lowercase z which is what his expression is)

http://www.asciitable.com/

[aeroswat]

My regex does...and yes there are

http://www.asciitable.com/

 

There are between cap Z and low a but not between cap A and cap Z. So I'm seeing this on some sites... would this do what I want it to?

 

/[^0-9A-Za-z]/

 

I want to use ur example Jay but I would think that it is case sensitive and being a ISBN there will mostly be capitals unless the person is too lazy to put caps

[JAY6390]

oops. Thats what I meant. Yes it will although I don't see what was wrong with my regex? it was case insensitive (hence the i after the /) so it does the same thing

[aeroswat]

oops. Thats what I meant. Yes it will although I don't see what was wrong with my regex? it was case insensitive (hence the i after the /) so it does the same thing

 

Sorry I didn't know what the /i meant. I don't know much about reg expressions at all. So would this be what i would do to remove all of the non a-z's and 0-9's

 

preg_replace("/[^0-9a-z]/i", "", $bookISBN)

[JonnoTheDev]

Use ereg as opposed to preg. eregi is case sensitive. preg is obsolete or will be soon

$result = eregi_replace('[^0-9a-z]', '', $bookISBN);

[JAY6390]

Yeah that will work fine. preg is OBSOLETE??? That is nonsense. It's recommended to use preg over eregi all the time. Where on earth did you get that idea from?

[aeroswat]

Use ereg as opposed to preg. eregi is case sensitive. preg is obsolete or will be soon

$result = eregi_replace('[^0-9a-z]', '', $bookISBN);

 

I'm seeing that the ereg functions were deprecated in 5.3

 

anyways thanks guys!

[JAY6390]

Yes and removed in PHP6

http://www.php.net/eregi

[JonnoTheDev]

Yes and removed in PHP6

http://www.php.net/eregi

 

Sorry wrong way round. ereg is obsolete not preg, my bad I knew it was one of them.

$result = preg_replace('/[0-9a-z]/i', '', $subject);