Question

如果存在少量单词，我想匹配一个句子，如果存在某些其他单词则丢弃该匹配。

例如：

如果字符串有＆＃34; consumer＆＃34;我希望正则表达匹配发生。和＆＃34;服务＆＃34;如果字符串有单词＆＃34;延迟＆＃34;。

，则匹配不会发生

匹配发生：

"Consumer are offered services based on the plans selected"

不匹配：

"In case ,the consumer services are delayed then penalty shall be beared."

为匹配而写的正则表达式：

(\b(?:consumer)\b.*?services)

Answer 1

你真的需要一个正则表达式吗？我认为没有一个代码会更容易理解：

input = 'Consumer are offered services based on the plans selected'

input_lower = input.downcase

input_lower.include?('consumer') &&
  input_lower.include?('services') &&
  !input_lower.include?('delayed')

这并不是完全检查你问的内容，因为它没有找到字边界（例如'Consumers'也会匹配）但是，无论如何，这可能是可取的。

Answer 2

您可以使用否定前瞻：

▶ input = ["Consumer are offered services based on the plans selected",
▷   "In case ,the consumer services are delayed then penalty shall be beared."]  

▶ input.map { |line| line =~ /(?!.*delayed)(consumer|services)/ }
#⇒ [21, nil]

正则表达式：根据单词匹配/不匹配排除或包含匹配项

2 个答案: