bolt/test/scan/000-bolt-identifier.md

---
type: scan
expect: BoltIdentifier
split-lines: true
---

The most simple identifiers are those made out of ASCII letters:

```
Foo
Bar
Baz
```

However, they may also contain digits as long as they do not begin with a
digit:

```
Var1
Var2
Var10029384
```

Identifiers may be as long as you want:

```
ThisIsALongAndValidIdentifier
ThisIsAnEvenLongerButStilCompletelyValidIdentifier
```

Moreover, they may have arbitrary underscores (`_`) in their names.

```
a_valid_identifier
another__0000__valid_identfier
_1
__2
___3
```

They may even be nothing more than underscores:

```
_
__
___
```

All identifiers starting with a `ID_Start` character are valid identifiers,
including `Other_ID_Start`:

```
℘rototype
℮llipsis
```

Likewise, the following code points using `Other_ID_Continue` are also valid:

```
α·β
ano·teleia
```

And, of course, the combination of `ID_Start` and `ID_Continue`:

```
alfa·beta
```