Does not work on Chrome on an iPad

For reference.

Code:
```dart
Casing.kebabCase(pascalCaseName)
```

Error:
```dart
FormatException: Illegal RegExp pattern (SyntaxError: Invalid regular expression: invalid group specifier name)
(?<=[a-z])(?=[A-Z])|(?<=[A-Z])(?=[A-Z][a-z])
```
