change file names

[Jerry]

Hi All *nix experts.

Sorry I'm being thick-skinned again here, and begging for the answer of a
no-brainer question.

I have a bunch of files located in the same directory "/export".

Their file names look like below:

exp1eve1.txt
exp1eve2.txt
exp1eve3.txt
exp1eve4.txt
.....

The pattern is that only the last character changes, as you can see,
from 1 to 4.

My goal is to find a short solution to replace all 4th character, which
is "1",  with "2", so they will look like this:

exp2eve1.txt
exp2eve2.txt
exp2eve3.txt
exp2eve4.txt
.....

Any input is much appreciated.
Thanks,
Zhao
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