How to mass replace old dead links with new links in a Wordpress blog?

[qloolp]

I think this will not work for such as:

replace
http://www.filesonic.com/file/1246786931/file.part1.rar

with
http://www.filesonic.com/file/1143784991/file.part1.rar


Where the filename file.part1.rar in both link is same.

If I were you, I'll try

search : 1246786931/file.part1.rar
replace : 1143784991/file.part1.rar


It should work.

but 20k+ link replace is pain in the ass

You need some custom php that do it automatic. Unfortunately I think that there are no free code to make this job done.