How to replace a specific html tag in bulk?

I imported a Blogger XML to WordPress, but Blogger converts the tag !--more-- into a name='more'/a, which is something that WordPress doesn't recognize as it should (I lost the Read More option).

How can I edit, maybe in plain text, and replace the old tag for the new one? Is there a "file", where I can see all posts and make this replacement?

Topic blogger xml read-more html Wordpress

Category Web

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