XF 1.1 Regular Expressions

A simple SQL query will do that.

Code:
UPDATE xf_post SET message = REPLACE(message,'current_content','new_content');

So in your case:
Code:
UPDATE xf_post SET message = REPLACE(message,'http://www.domain.com/content/','http://www.domain.com/threads/');

Take a backup first, just in case.
 
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