Sounds like you want
CDPATH. Given the following entry in
.bash_profile,
export CDPATH=.:~:~/www:~/tmp
you get the desired behaviour with cd:
[~]$ cd bin
/home/ikegami/bin
[~/bin]$ cd lib
/home/ikegami/lib
[~/lib]$ cd example.com
/home/ikegami/www/example.com
[~/www/adaelis.com]$
It'll save you from writing a bash parser (although a half-assed one should work).
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