Determine if String is ALPHANUMERIC

I give up, how do I determine if a string contains alphanumeric characters or
if it conatins  just  Space ???

I'm reading a line of text from a file.
Does it contain just 80 characters of space on this line? I can't tell.
I can find no command like isalphanumeric. What do I use?
Must be something simple I have overlooked!
jgoreAsked:
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MikeP090797Connect With a Mentor Commented:
If you want to determine if a string contains something more then spaces only:
If Len(Trim$(Str1))>0 then
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jgoreAuthor Commented:
Duh, I never even thought of that. I'm embarresed!  ;-)
Thanks!
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