本文深入解析了Ruby编程语言中特殊符号如$'、$&、$&的用法及其背后的逻辑，通过实际代码示例展示了这些符号在字符串操作、正则表达式匹配中的应用，旨在帮助开发者更好地理解并利用这些特性提升编程效率。
D:\compiler>irb
irb(main):001:0> line = "##DSL"
=> "##DSL"
irb(main):002:0> line =~ /##/
=> 0
irb(main):003:0> $'
=> "DSL"
irb(main):004:0> $&
=> "##"
irb(main):005:0> line = "## print jaljd ##"
=> "## print jaljd ##"
irb(main):006:0> line =~ /##.+##/
=> 0
irb(main):007:0> $'
=> ""
irb(main):008:0> $&
=> "## print jaljd ##"
irb(main):009:0> $&.delete("#")
=> " print jaljd "
irb(main):010:0> $&
irb(main):001:0> line = "##DSL"
=> "##DSL"
irb(main):002:0> line =~ /##/
=> 0
irb(main):003:0> $'
=> "DSL"
irb(main):004:0> $&
=> "##"
irb(main):005:0> line = "## print jaljd ##"
=> "## print jaljd ##"
irb(main):006:0> line =~ /##.+##/
=> 0
irb(main):007:0> $'
=> ""
irb(main):008:0> $&
=> "## print jaljd ##"
irb(main):009:0> $&.delete("#")
=> " print jaljd "
irb(main):010:0> $&
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