'what is type look like /cygwin|mswin|mingw|bccwin|wince|emx/ in ruby

i see /cygwin|mswin|mingw|bccwin|wince|emx/ in ruby but I don't have information about this data what is it ? for example

irb(main):001:0> /trwaw/
=> /trwaw/


Solution 1:[1]

If you are not sure about the class of an object then ask:

3.1.0 :001 > /trwaw/.class
 => Regexp

As @Jad says, it's a Regular Expression.

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Source: Stack Overflow

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