How to remove spaces from a string in Lua?

Question

I want to remove all spaces from a string in Lua. This is what I have tried:

string.gsub(str, \"\", \"\")
string.gsub(str, \"% \", \"\")
string.gsub(str, \"%s*\"         


        

Answer 1

You use the following function :

function all_trim(s)
  return s:match"^%s*(.*)":match"(.-)%s*$"
end

Or shorter :

function all_trim(s)
   return s:match( "^%s*(.-)%s*$" )
end

usage:

str=" aa " 
print(all_trim(str) .. "e")

Output is:

aae