Question

我想从字符串中删除单个字词：

str = "I would like to remove THIS word but not THIS word"

我只想删除第一个'THIS'，并给出结果：

str = "I would like to remove  word but not THIS word"

我在思考索引的内容：

word = 'THIS'
word.length # => 4
str.index(word) # => 23

有没有办法说，在第23个字符后删除4个字符？

我看到有很多方法可以删除前导和尾随字符，但不确定内部字符。 Gsub将删除该单词的所有实例，这不是我正在寻找的。

Answer 1

您可以使用sub，它只会影响第一个匹配事件。

str.sub!(word, '');

Answer 2

要仅删除第一次出现的THIS，请执行：

str.sub!("THIS", "")

要删除第23个字符后的四个字符（即第24个字符），请执行以下操作：

str[24, 4] = ""

Answer 3

str = "I would like to remove THIS word but not THIS word"
str.sub!(/\bTHIS\b/,'')
  #=> "I would like to remove  word but not THIS word" 

str = "THISTLE sounds like WHISTLE. I want to remove THIS word"
str.sub!(/\bTHIS\b/,'')
  # => "THISTLE sounds like WHISTLE. I want to remove  word"

，而

str.sub("THIS", '')
  #"TLE sounds like WHISTLE. I want to remove THIS word"

正则表达式中的

\b是"word break"。（搜索“锚点”。）

从字符串中删除单个内部字符实例

3 个答案: