我有一个字符串数组,这些字符串的长度和内容各不相同。现在我想要一种简便的方法从每个字符串中提取最后一个单词,而不用知道该单词的长度或该字符串的长度。类似于:
array.each{|string| puts string.fetch(" ", last)
array.each{|string| puts string.fetch(" ", last)
这应该能正常工作
"my random sentence".split.last # => "sentence"
要排除标点符号,删除
它
"my random sentence..,.!?".split.last.delete('.!?,') #=> "sentence"
从数组中获取最后一个元素,你需要使用collect
方法,将其转换为数组。
["random sentence...", "lorem ipsum!!!"].collect { |s| s.split.last.delete('.!?,') } # => ["sentence", "ipsum"]
array_of_strings = ["test 1", "test 2", "test 3"]
array_of_strings.map{|str| str.split.last} #=> ["1","2","3"]
["one two", "three four five"].collect { |s| s.split.last }
=> ["two", "five"]
str = 'Non-space characters, like foo=bar.'
str.split(/\W/).last
# "bar"
"a string of words!".match(/(.*\s)*(.+)\Z/)[2] #=> 'words!'
从最后一个空格开始匹配,包括标点符号。
要从字符串数组中提取它,请与 collect 一起使用:
["a string of words", "Something to say?", "Try me!"].collect {|s| s.match(/(.*\s)*(.+)\Z/)[2] } #=> ["words", "say?", "me!"]
这是我能想到的最简单的方法。
hostname> irb
irb(main):001:0> str = 'This is a string.'
=> "This is a string."
irb(main):002:0> words = str.split(/\s+/).last
=> "string."
irb(main):003:0>