Feature: Index regex interpolation tokens
Feature: Index regex interpolation tokens

Issue: #3220

```raku
$variable
$(code)
<$variable>
<{code}>
<?{}>
<!{}>
<?>
<!>
<?before>
<?after>
```

MasterDuke17/doc,MasterDuke17/doc,tbrowder/doc,MasterDuke17/doc,tbrowder/doc,MasterDuke17/doc,tbrowder/doc,tbrowder/doc