ruby - 如何从出现在数组中的字符串中选择整个单词？

Question

我想根据单词数组检查一个长字符串并选择匹配的单词。这些词可以是多个词 such as 或 This is 或 more。这是我目前所拥有的。

str = "This is a demo text for demo..."
w = ["This is", "to", "is", "for demo"]     
w.select{ |w| str.include?w } #=>["This is", "is", "for demo"] 

但在此我不希望我的结果有“in”、“get”等

str = "This is a demo text for demo together within..."
w = ["This is", "to", "is", "for demo", "in", "get"]    
w.select{ |w| str.include?w } #=> ["This is", "to", "is", "for demo", "in", "get"]

str.include?w 正在做它应该做的事情。有没有其他选择？

Answer 1

str = "This is a demo text for demo..."
w = ["This is", "to", "is", "for demo"]     
p w.select{|w|str =~ /\b#{w}\b/ }

正则表达式中的\b是一个单词边界； #{w} 是插值，就像在字符串中一样。