regex - Syntax for definition -

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What is syntax in MSDN for definition and how should it be interpreted? 

  connection-string :: = empty string [;] | Attribute [.] | Specialty; Connection string string string :: = attribute :: = attribute-keyword = attribute-value | Driver = [{] attribute-value [}] attribute-keyword :: = DSN | UID | PWD | Driver-defined-attribute-keyword attribute-value: = character-string driver-defined-attribute-keyword :: = identifier

Is this some type of regular expression?

This is a meta-language which is appropriate for describing language presentations.


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