[Israel.pm] Detecting Random characters

[Ronen Angluster]

Hello,
does anyone know of a method/algorythm in perl that can detect a string
of random characters?
i.e: know that "fafafXswewe" is non valid and "testing" or "ronen" is valid?
i dont want to use a dictionary of valid words because it would need
to invole all the words there is...

Regards,
Ronen Angluster

p.s: i do know how impossible it looks, i just had to ask