How to only allow characters that can be used in a header?

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#1

I’m working with an API and I only want allowed characters through a header. For example, I want to block out characters such as %, and ?.
So this sentence “Hello, how are you?”
Would turn into “Hello, how are you”

#2

Take all the unwanted characters and store them in an array. Then what you wanna do is use string.gsub(), here is an example:

local str = "Hello, how are you?"

local str = string.gsub(str, "?", "") --> First argument is the string, second argument is what we are looking for, third agrument is replacing it with empty string.

print(str) --> This is gonna print 'Hello, how are you'
1 Like
#3

Do you know of a list of all of the characters somewhere?

#4

Use string.gsub to remove words that you don’t want.

local str = '%%Hey this is a test?'
local new = string.gsub(str, '[%%%?]+', '')
print(new) --> Hey this is a test
1 Like
#5

You can actually simplify this by using the string pattern %p, which will match any punctuation character.

Modified code:

local str = '%%Hey this is a test?'
local new = string.gsub(str, '%p', '')
print(new) --> Hey this is a test
2 Likes
#6

I found something that is working

str:match("[%P]+")