The meaning of `\w` changed from python 2 to python 3.
> $ python3.5 -c "import re; print(re.compile(r'[a-zA-Z]\w*$').match(u'a\xe8'));"
> <_sre.SRE_Match object; span=(0, 2), match='aè'>
> python -c "import re; print(re.compile(r'[a-zA-Z]\w*$').match(u'a\xe8'));"
> None
but the definition of what's an acceptable javascript identifier should not vary from case to case.
