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create code fences with backticks ` or tildes ~
```
like so
``` -
add language identifier to highlight code
```python
def function(foo):
print(foo)
``` - put returns between paragraphs
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[[:punct:]]instead of just-made it match commas too) and added both lookbehind to the search regexp and some more explanation. So you probably want to copy-paste another copy of the new & improved script.