String comparison.

Hi,

I have got a simple requirement.

If the GL acct is all numeric i.e. they contain only(0-9)

else If the GL acct contains non-numerics (alphabetics or special characters), then

here i am using if gl_acct NA 'a..z symbols'.

but problem i am facing is which all symbols shall i use. what happens if lower- upper case is there.

need help.

tnx.

Vikash