I am attempting to search a string for a specific word ('cow') using the following:

var regex = new RegExp('cow', '\b');

I only wish to target 'cow' and not words which contain 'cow' such as 'cowboy' or 'cows' using the 'b' expression, however this results in:

Uncaught SyntaxError: Invalid flags supplied to RegExp constructor
'b'

I have attempted to use 'b', 'b', '/b' but all result in the same error.

What is the correct expression I need to use?