Ruby中的字符串占位符的替换值是操作字符串的常用方法，使用#进行变量或者ruby代码的求值，从而替换结果插入字符串中
#/usr/bin/env ruby
book_mark = "znw123"
# following replace and insert
puts "The book mark is #{book_mark}"
#following run ruby code, string length and insert
puts "The book mark length is #{book_mark.length}"
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