possible to change how vim defines a 'word'?

Apparently uses the groups of the characters [a-zA-Z_] to define a
word, e.g. for use by 'b' or 'w' commands.

Since I work a lot with ip addresses I would like vim to be able to
recognise a valid ip address and treat that as word too (a regexp for
ip address would be [0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3} )

Is this possible with vim?

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