Question

i need to check if a word are just with letter
example “hfjel” return true
“df(f0” return false

and anyone can explain me the function symbol-name
thank you for help

Answer 1

There is a handy standard function called alpha-char-p that does what you’re asking for.

CL-USER(1): (alpha-char-p #\a)
T
CL-USER(2): (alpha-char-p #\Γ)
T
CL-USER(3): (alpha-char-p #\α)
T
CL-USER(4): (alpha-char-p #\0)
NIL
CL-USER(5): (alpha-char-p #\.)
NIL

You can use it in conjunction with every:

CL-USER(7): (every #'alpha-char-p "word")
T
CL-USER(8): (every #'alpha-char-p "nonword7")
NIL
CL-USER(9): (every #'alpha-char-p "non-alpha-word")
NIL
CL-USER(10): (every #'alpha-char-p "今日は")
T