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ruby - regex match and split in ruby

问题描述

I have an big string of this format:

FA dir_name1 file_name1
FA dir_name1 file_name2
FA dir_name2 file_name1
FA dir_name2 file_name2
....

I was thinking if we can write an regex expression while doing split which returns me an array consisting of this:

["dir_name1/file_name1", "dir_name1/file_name2", "dir_name2/file_name1", "dir_name2/file_name2"]

I have tried splitting the big string first and then do regex. It works but can't we do it using easier way?

Any other way to do this?

标签： ruby

解决方案

As you wish to get an array out of string, some split is required.

input.scan(/(?<=^FA ).*$/).
      map { |e| e.split.join('/') }
#⇒ [
#   [0] "dir_name1/file_name1",
#   [1] "dir_name1/file_name2",
#   [2] "dir_name2/file_name1",
#   [3] "dir_name2/file_name2"
#  ]

It scans the input using positive lookbehind to get the desired result out of the box, splits it by space and joins with a slash.

Another way round would be to just split several times:

input.
  split($/).
  map { |line| line.split[1..-1].join('/') }

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