Get specific int from string

Question

I am new on Lua, the following is a string:

...
Test 1
abc 30
bcd 40
cde 50
...
Test 2
abc 30
bcd 40
cde 50
...

I wanna get the Int of each Test, how should I managed to achieve this? any suggestion will be appreciated!!!

Answer 1

Adapt the code below to your needs. The input string is in s.

for k in s:gmatch("Test%s+(%d+)") do
   print(k)
end

Answer 2

Generally,

a = "5"

can be converted into number using tonumber function.

val = tonumber("5") or val = tonumber(a)

gives 5 as a number from "5" which was string previously.

Answer 3

Extract numeric part with string.match and convert it with tonumber.

local str = "abc 321"
print(tonumber(str:match("%d+")))