How to remove multi-line text pattern from all text files (recursively)?

I want to remove this pattern from all text files walking through the directories (recursively) with Windows batch script (.bat).

How to do that?

Here's a 开发者_开发百科multi-line text pattern:

/* this is
a multi-line
pattern
*/

---

I'd say cmd isn't efficient enough to do that. Try python or some other a-bit-higher-language.