如何在Ruby中匹配完整的单词而不是子串

Question

这是我的代码

stopwordlist = "a|an|all"
File.open('0_9.txt').each do |line|
line.downcase!
line.gsub!( /\b#{stopwordlist}\b/,'')
File.open('0_9_2.txt', 'w') { |f| f.write(line) }
end

我想删除单词 - a,an和all但是,它也匹配子串并删除它们

输入示例 -

Bromwell High is a cartoon comedy. It ran at the same time as some other programs about school life

我得到输出 -

bromwell high is  cartoon comedy. it r t the same time s some other programs bout school life

如您所见,它与子字符串匹配.

如何使它与单词匹配而不是子串？

Answer 1

|正则表达式中的运算符占用最广泛的范围.您的原始正则表达式匹配\ba或者an或all\b.

将整个正则表达式更改为:

/\b(?:#{stopwordlist})\b/

或者stopwordlist改成正则表达式而不是字符串.

stopwordlist = /a|an|all/

更好的是,您可能想要使用Regexp.union.