Quick Question on Regular Expressions

[leek]

I'm not that great at regular expressions, in fact, I know nothing about them. Of course I could learn it, but not enough time right now.

Anyways, my question is this:

If I have a variable $aNumber that equals "555a" or some other number/letter combination, how can I test it to see if it is all numbers or not?

Also, If I have a variable $aString that equals "aaa5", how can I test it to see if it is all letters or not?

The reason I ask is, I don't want people putting in any numbers in as their name, and I don't want people putting any letters in as their SSN.

Thanks in advance.

[DR_LaRRY_PEpPeR]

to check if something is all numbers:

if (preg_match('/^\\d+$/', $txt)) { /* it's all numbers */ } 

all letters:

if (preg_match('/^[a-z]+$/i', $txt)) { /* all letters */ } 

[leek]

Thanks alot, worked great.