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How to validate steps:

validate is either a single element or an array of either string or object

If an element is a string it'll be considered a regex, if it's an object it'll be validated depending on the type. For the moment we only have type: fn which will contain a function which can receive a string representing the line that it's validating.

The prefix @@ tells the validator that it has to escape the string to be a RegExp.

You might want to use @@ when validating against something like @@mosquito = (x,y) ->

If the array contains more than one element, the validator will check more than 1 line.

steps: [
    {
     ...
     validate:     "^for *"
    },
    {
     ...
     validate: [
         { 
           "type": "function" 
           "fn"  : "function (str) {return str.length===3;}"
         }
     ]
    },
    {
     ...
     validate: [
         'color white',
         { 
           "type": "function" 
           "fn"  : "function (str) {return str.length===3;}"
         }
     ]
    },

]