Determine string variable type

[Kevin]

this should work for you
try this rx

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if(findrx(s[i] "\D+(?=\d)|\d+(?!.+)|\_(?=\D+)")>=0)

 full code example

Code:

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ARRAY(str) s
s[]="a2" ;;Case 1
s[]="_b" ;;Case 2
s[]="3" ;;Case 3

s[]="2a" ;;Case 4
s[]="C:\Users\Administrator\Desktop\test.txt" ;;Case 5
s[]="C:\Users\Administrator\Desktop" ;;Case 6
s[]="世界" ;;Case 7

for int'i 0 s.len
,if(findrx(s[i] "\D+(?=\d)|\d+(?!.+)|\_(?=\D+)")>=0)
,,out s[i]
,else
,,out F"''{s[i]}''"