ruby - 如何从 Ruby 2.0 中的字符串数组中获取值

Question

我有这个字符串数组：

array = [ "nike air", "nike steam","nike softy" ,"nike strength",
          "smooth sleeper","adidas air","addidas jogar","adidas softy","adidas heels"]

我想从中提取字符串作为类似 SQL 的查询。

例如，如果用户输入单词“nike”。然后应该返回 4 个字符串作为结果

           "nike air", "nike steam","nike softy" ,"nike strength"

例如，如果用户输入单词“adidas”。然后应该返回 4 个字符串作为结果

           "adidas air","addidas jogar","adidas softy","adidas heels"

可能吗？

Answer 1

array.grep(query)

返回与查询匹配的数组子集。

Answer 2

使用Enumerable#grep：

matches = array.grep /nike/

添加/i不区分大小写。从字符串构造正则表达式：

re = Regexp.new( Regexp.escape(my_str), "i" )

或者，如果您希望您的用户能够使用特殊的正则表达式查询，只需：

matches = array.grep /#{my_str}/

Answer 3

或者您可以自己构建查询方法：

def func( array )
  array.each_with_object [] do |string, return_array|
    return_array << string if string =~ /nike/
  end
end

Answer 4

array = [ "nike air", "nike steam","nike softy" ,"nike strength",
          "smooth sleeper","adidas air","addidas jogar","adidas softy","adidas heels"]
array.select{|i| i.include? "nike"}

# >> ["nike air", "nike steam", "nike softy", "nike strength"]