Ruby grep与行号 [英] Ruby grep with line number

问题描述

使用Ruby的 Enumerable＃grep 方法获取匹配行与行号的最佳方式是什么？ （因为我们使用 -n 或 - line-number 使用grep命令切换）。

What could be the best way of getting the matching lines with the line numbers using Ruby's Enumerable#grep method. (as we use -n or --line-number switch with grep command).

推荐答案

Enumerable＃grep不会让你这样做，至少在默认情况下。相反，我想出了：

Enumerable#grep doesn't let you do that, at least by default. Instead, I came up with:

text = 'now is the time
for all good men
to come to the aid
of their country'

regex = /aid/

hits = text.lines.with_index(1).inject([]) { |m,i| m << i if (i[0][regex]); m }
hits # => [["to come to the aid\n", 3]]

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