有没有办法，将字符串中的空格更改为下划线？

Question

function exists(f)
    filetry=""
    local fileBuffer={}

    for w in x:gmatch("%S+") do 
        table.insert(fileBuffer,w)
    end

    for i, v in ipairs(fileBuffer) do 
        filetry=filetry.."_"..v
    end

    f=filetry

    if os.execute("test -e "..f) == true then
        return true 
    else 
        return false
    end
end

i need to change space characters to underscore so i can find the file in termanal i have tried to use apis but it's not working for me due to my computer deletes it after install it. so i just need a function that can make spaces , underscore and ,use the termanal test command to find a file

Answer 1

str = str:gsub("%s+", "_")
-- where `str` is the string you want to remove the spaces from.
-- Replaces multiple consecutive space characters with single _.
-- Remove the `+` to make it replace each space character with its own _.

Example:

print( ("Hello world"):gsub("%s+", "_") )
-- will print "Hello_world"

EDIT: Note that string.gsub() creates a new string instead of modifying the old one, which is why in my first example the reasignation str = str:gsub... was necessary.