Using mysql to replace img src?

This feels like it is too link-heavy for an answer, but oh well. You can either use the Velvet Blues Update URLs plugin or the Serialized Search and Replace script. Either will allow you to search for a string in the database and change it to something else. The former lets you do it from your dashboard, whereas the latter requires you to FTP the file to your server and then navigate to that new page.

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