Question

I’m using named rexeg capture groups and my case statement works with match, but it gives me data that I don’t want. When I run the code below it only works to match one statement. Where am I going wrong?

File::open(file).lines do |line|
    case
      when line.scan(regex1) then puts line.scan(regex1)
      when line.scan(regex2) then puts line.scan(regex2)
      when line.scan(regex3) then puts line.scan(regex3)
    end
  end
end

Answer 1

caseexecutes the first true-expresion.

If you have multiple checks, where each check can be true, you should use mutliple if-statements.

File::open(file).lines do |line|
  puts line.scan(regex1) if line.scan(regex1)
  puts line.scan(regex2) if line.scan(regex2)
  puts line.scan(regex3) if line.scan(regex3)
end

I think the following version is a bit more flexible and efficient:

File::open(file).lines do |line|
  [ regex1, regex2, regex3] do |regex|
    if result =  line.scan(regex)
            puts result
    end
  end
end