Finding text in array Ruby

Question

I have a code

require 'rubygems'
conf_array = []
File.open("C:/My Program Files/readme.txt", "r").each_line do |line|
conf_array << line.chop.split("\t")
end

a = conf_array.index{|s| s.include?("server =")}
puts a

and it doesn't display the index of item. Why?

Array looks like

conf_array = [
  ["# This file can be used to override the default puppet settings."],
  ["# See the following links for more details on what settings are available:"],
  ["# - docs.puppetlabs.com/puppet/latest/reference/config_important_settings.html"],
  ["# - docs.puppetlabs.com/puppet/latest/reference/config_about_settings.html"],
  ["# - docs.puppetlabs.com/puppet/latest/reference/config_file_main.html"],
  ["# - docs.puppetlabs.com/references/latest/configuration.html"], ["[main]"],
  ["server = server.net.pl"],
  ["splay = true"],
  ["splaylimit = 1h"],
  ["wiatforcert = 30m"],
  ["http_connect_timeout = 2m"],
  ["http_read_timeout = 30m"],
  ["runinterval = 6h"],
  ["waitforcert = 30m"]
]

And next how to display that item? I mean a = conf_array[#{a}] says syntax error.

I tried also

new_array = []
new_array = conf_array.select! {|s| s.include?("server =")}

and it again does't display found item. Any suggestion?

"ruby" is one of your tags, as it should be. It's redundant to have "Ruby" in the question's title. — Cary Swoveland
– Cary Swoveland, Commented Feb 24, 2017 at 16:31

Aleksei Matiushkin · Accepted Answer · 2017-02-24 12:15:52Z

2

Perfect use case for Enumerable#grep

File.open("C:/My Program Files/readme.txt", "r")
    .each_line
    # no need to .flat_map { |l| l.split(/\t/) }
    .grep /server =/
#⇒  ["server = server.net.pl"]

answered Feb 24, 2017 at 12:15

Aleksei Matiushkin

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4 Comments

mila002 Over a year ago

That works. Is there any posisbility to prevent finding text e.g. "sn_server ="?

Aleksei Matiushkin Over a year ago

Enumerable#grep accepts a regular expression. Pass /^server = / to lookup for server in the beginning of the line etc. The margins are too small to explain how regexps work in details.

mila002 Over a year ago

In notepad++ anything I write after /^server = / doesn't work. Why?

mila002 Over a year ago

OK, I found File.open("C:/My Program Files/readme.txt", "r").each_line.grep(/server =/)

Eric Duminil · Accepted Answer · 2017-02-24 12:11:51Z

1

The problem is that you don't call String#include?, but Array#include? :

["server = something.pl"].include?('server = ')
# false
"server = something.pl".include?('server = ')
# true

Remove the split("\t").

To read the file into an array, you can just use :

conf_array = File.readlines("C:/My Program Files/readme.txt")

or

conf_array = File.readlines("C:/My Program Files/readme.txt").map(&:chomp)

answered Feb 24, 2017 at 12:11

Eric Duminil

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