How to generate random alphanumeric string in julia?

问题

I am trying to generate 12 characters alphanumeric string in julia with the following snippets:
a)
an = randstring(rand(Bool) ? ('A':'Z') : ('0':'9'), 12)
b)

an = "" 
for i in [1:12]
    an *= randstring(rand(Bool) ? ('A':'Z') : ('0':'9'))
end

but both gives either complete 12 digits or 12 alphabets but not of their combination.

please guide me in generating combination of 12 alphanumeric string.

回答1:

If you don't mind using both upper and lower case letters, you can simply call randstring(12):

julia> using Random

julia> randstring(12)
"0IPrGg0JVONT"

julia> randstring(12)
"EB5dhw4LVno7"

If you want only uppercase letters (and numbers), then you need to pass randstring a collection that includes only uppercase letters and numbers, which you can achieve with ['A':'Z'; '0':'9']:

julia> randstring(['A':'Z'; '0':'9'], 12)
"ASZQAT5YX3OL"

julia> randstring(['A':'Z'; '0':'9'], 12)
"FEV5HTGMLQ6X"

Finally, note that you could provide the collection of characters as a string:

julia> randstring("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789", 12)
"ASZQAT5YX3OL"

来源：https://stackoverflow.com/questions/56453509/how-to-generate-random-alphanumeric-string-in-julia