[riffraff]

moreover you actually already have trivial code for that in $JAVAISH_IMPLEMENTATIon's Character.isUnicodeIdentifier{start,part}

[jere_jones]

I used Character.isJavaIdentifierStart(int) and Character.isJavaIdentifierPart(int) to write a file with the ranges that I cut and pasted into my C# code. And thank goodness, too! I'm sure I would've made a typo or missed characters if I had to type all that myself.