Multi-byte character as delimiter

[Haakon Storm Heen]

Hello all!

### My setup

`Darwin 10core.local 19.3.0 Darwin Kernel Version 19.3.0:`
`zsh 5.7.1 (x86_64-apple-darwin19.0)`
`gsed (GNU sed) 4.8`

### What I'm trying

```
cat example.txt|gsed "s✋$(printf '\t')✋|✋"
```

### Error

```
gsed: -e expression #1, char 2: delimiter character is not a single-byte 
character
```

### Workaround? Feature request?

- Any way around this?
- Should I add multibyte delimiter characters as a feature request?

//Storm


---

The rationale behind this is:

- emoji/unicode are (IMHO) better visual indicators (than plain `ascii`)
- many files I process are scripts that might contain the usual 
delimiter characters `/` `_` `|` ...
- replacing a 🤚 by mistake with something else is not as detrimental 
as replacing `/` or `|` if the file happens to be a shell script.

(`gsed` is symlinked to GNU sed by Homebrew on Mac).



/storm