Ruby 去掉结尾空格

有几个方法可选

• strip() #对字符串中间的空白不做任何处理

 irb(main):012:0> " \tHello \n world.\r\n  ".strip
=> "Hello \n world."
irb(main):013:0> " \tHello \n world.\r\n  ".lstrip
=> "Hello \n world.\r\n  "
irb(main):014:0> " \tHello \n world.\r\n  ".rstrip
=> " \tHello \n world."

*gsub() #用正则表达式全字符串匹配

irb(main):020:0> " \tHello \n world.\r\n  ".gsub(/\s+/,‘‘)
=> "Helloworld."
irb(main):021:0> " \tHello \n world.\r\n  ".gsub(‘ ‘,‘‘)
=> "\tHello\nworld.\r\n"
irb(main):023:0> " \tHello \n world.\r\n  ".gsub("\n",‘‘)
=> " \tHello  world.\r  "
irb(main):024:0> " \tHello \n world.\r\n  ".gsub("\n",‘‘).gsub("\r",‘‘)
=> " \tHello  world.  "

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