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echo "${BASH_REMATCH[1]}" -- see BashPitfalls #14.
– Charles Duffy
Commented Apr 18, 2020 at 2:14
2

That said, usually I wouldn't use a regex for this at all. filename=${path##*/}; filename=${filename%.zip} will arrive at your original intent, using only parameter expansions.
– Charles Duffy
Commented Apr 18, 2020 at 2:14

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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
for linebreak add 2 spaces at end
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indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
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