How to split string into two arrays in Lua?

Question

I am using Lua and i have a file that i want to split each line into two different arrays. Each line of my file contains two string seperated with a space. for example if my file contains

 something something_else

I should have

tab_1[1] = something
tab_2[1] = something_else

I tried using split like

file =io.open("myfile.txt", "r")
for line in file:lines() do
line = file:read()
for value in split(line," ")
table.insert(tab_1,value[i])
table.insert(tab_2,value[i])
i=i+1
end

it seems to be wrong as i know split probably does not return an array but i know that it return different string . How can i manage them .

tab_1[1] and tab_2[2]? That seems a bit strange. Also, from your code it seems more like you want tab_1[1] and tab_2[1]. — ComicSansMS
– ComicSansMS, Commented Jul 22, 2013 at 10:43
yes i was wrong about that ouuups it is tab_1[1] and tab_2[1] — HobbitOfShire
– HobbitOfShire, Commented Jul 22, 2013 at 11:21

Egor Skriptunoff · Accepted Answer · 2013-07-22 10:17:57Z

1

for line in io.lines'myfile.txt' do
  local v1, v2 = line:match'(.-)%s+(.*)'
  table.insert(tab_1,v1)
  table.insert(tab_2,v2)
end

answered Jul 22, 2013 at 10:17

Egor Skriptunoff

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5 Comments

HobbitOfShire Over a year ago

actually that did not work as expected actually i don't know if i was clear enough but my file contains urls and ip addresses separated by a space it is not just simple words . The second variable v2 does not get any value

Egor Skriptunoff Over a year ago

Please show an example of string from your text file where v2 gets no value with my code.

HobbitOfShire Over a year ago

i couldnt put the http url as it is because it will be a link

Egor Skriptunoff Over a year ago

Works fine for me. Test it with another lines and give a link where the problem is.

HobbitOfShire Over a year ago

your code is just fine @Egor it was something wrong with my code and i fix it , thanks for your time and help

moteus · Accepted Answer · 2013-07-22 10:25:49Z

1

for line in io.lines('myfile.txt') do
  local v1, v2 = string.match(line, "^(%S+)%s+(%S+)$")
  if v1 and v2 then
    table.insert(tab_1,v1)
    table.insert(tab_2,v2)
  else
    -- wrong line
  end
end

answered Jul 22, 2013 at 10:25

moteus

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