如何在ruby中的两个字符串之间获取文本？

Question

我有一个包含此文本的文本文件：

What's New in this Version
==========================
-This is the text I want to get 
-It can have 1 or many lines
-These equal signs are repeated throughout the file to separate sections

Primary Category
================

我只想获取 ========================== 和 Primary Category 之间的所有内容，并将该文本块存储在变量中。我认为以下匹配方法会起作用，但它给了我 NoMethodError: undefined method `match'

    f = File.open(metadataPath, "r")
    line = f.readlines
    whatsNew = f.match(/==========================(.*)Primary Category/m).strip

有任何想法吗？提前致谢。

Answer 1

f是一个文件描述符 - 你想匹配文件中的文本，你读入line. 我更喜欢做而不是将文本读入数组（这很难正则表达式）只是将其读入一个字符串：

contents = File.open(metadataPath) { |f| f.read }
contents.match(/==========================(.*)Primary Category/m)[1].strip

最后一行产生您想要的输出：

-This is the text I want to get \n-It can have 1 or many lines\n-These equal signs are repeated throughout the file to separate sections"