我想在“这个词”之前删除文件的内容 并且只将该字后面的行写到磁盘上。
text = <<EOT
I only want
the last lines
of the file after
this word. This is
the content I
want. Yet this
word can appear again.
EOT
puts text.scan("this word")
预期产出:
This is
the content I
want. Yet this
word can appear again.
最有效的方法是什么?
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泰德。
答案 0 :(得分:1)
如果“此单词”在测试中只出现一次,或者您想删除最后一个短语:
text.sub(/.*this word\W*/, '')
如果'this word'有可能出现多次,并且您只想删除第一个这样的话:
text.sub(/.*?this word\W*/, '')
答案 1 :(得分:0)
喜欢这个吗?
irb(main):001:0> text = <<EOT
irb(main):002:0" I only want
irb(main):003:0" the last lines
irb(main):004:0" of the file after
irb(main):005:0" this word. This is
irb(main):006:0" the content I
irb(main):007:0" want.
irb(main):008:0" EOT
=> " I only want\n the last lines\n of the file after\n this word. This is\n the content I \n want.\n"
irb(main):009:0> needle = 'this word. '
=> "this word. "
irb(main):012:0> text[text.index(needle)+needle.length..-1]
=> "This is\n the content I \n want.\n"
irb(main):013:0> print text[text.index(needle)+needle.length..-1]
This is
the content I
want.
=> nil
答案 2 :(得分:0)
一种简单的方法是使用分区方法:
text.partition("this word. ").last
(这假定“这个词。”实际上出现在变量文本中。如果没有,则此代码将返回一个空字符串。)
答案 3 :(得分:0)
一种方式:
text.split('this word. ')[1]
或者
text.split('this word. ').last