Recently, I had noticed lots of 404 error generated by my wordpress software. My old wordpress tag structure changed from:
/tips/tag/linux_software
/tips/tag/one_two_foo
To:
/tips/tag/linux-software
/tips/tag/one-two-foo
As a result lots of error 404 was dumped into my log file. I wrote a small php code to get rid of the problem.
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