Cygwin bash regexp matching doesn't treat "\b" properly

[aputerguy]

The following behavior differs between Cygwin bash (both versions 3.2.39,
3.2.49) and Fedora/Linux bash (both versions 3.2.33 and 4.0.33):

$ [[ "foo" =~ \\bfoo\\b ]]; echo $?

Cygwin:
1

Linux:
0

Cygwin returns 0 only if I remove the \\b from before and after the word
'foo'

What is going on here?
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