Integrate with JavaScript RegExp object

Javascript has a RegExp object, which should be usable in places (like QRegExpValidator) which require a QRegExp. Currently the below snippet does not work in QML, when someone with a javascript background would like it to.

TextInput { id: strInput;
validator: QRegExpValidator {
regExp: /[a-zA-z]

/
}
}

the specific error was 'validators.qml:18: Unable to assign null to QRegExp'.

This isn't a bug because the documentation doesn't say that this should work - but if it is not scheduled to be implemented soon the documentation should probably mention that it doesn't work.