remove all non-alphanumeric characters from lua string

Question

I checking string for a non-alphanumeric char.

if(str:match("%W")) then
  --make str alpha-numeric
end

How to remove all non-alphanumeric chars from string using lua?

It works great. Thank you @EgorSkriptunoff and please make it as answer :) — polski, May 06 '13 at 19:41
@PaulKulchenko - Answer must contain at least 30 characters. I don't have so many :-) — Egor Skriptunoff, May 06 '13 at 20:29
@EgorSkriptunoff how hard can it be to add a sentence of explanation to get over 30 characters? — Martin Ender, May 06 '13 at 21:40
@EgorSkriptunoff, I'm sure you can add a link to `gsub`, which will easily make it over the threshold. Oh, well; I guess I can do that myself :) — Paul Kulchenko, May 07 '13 at 03:33

score 11 · Answer 1 · answered May 07 '13 at 03:34

11

Use gsub (as suggested by Egor Skriptunoff):

str = str:gsub('%W','')

answered May 07 '13 at 03:34

Paul Kulchenko

score -1 · Answer 2 · answered Jun 08 '20 at 12:50

-1

just make it like this you forgot +

if(str:match("%W+")) then --if it contain alpha
     number = str:match("%d+")
     alpha = str:match("%W+")
 end

answered Jun 08 '20 at 12:50

Master

2 Answers2