scripting help

[suser]

I am trying to create a script to go through /etc/passwd and change anyone
who's home directory is "/mnt/home" to "/mnt/<username on linux server>". I
have been playing around with loops and regular expressions but have not got
anything close to the results i want. I have roughly 1000 users so changing
them all by hand is quite the pain.

so basically im trying to do something like the following:

Original - user:x:1000:100:user:/mnt/home:/bin/bash

what i want - user:x:1000:100:user:/mnt/user:/bin/bash

any suggestions? thanks in advance!
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