Assertion: expression's character | /r/CapableOf | begin identifier
Facets:
Source sentences:
text: The editor Vim further distinguishes word and word-head classes (using the notation \w and \h ) since in many programming languages the characters that can begin an identifier are not the same as those that can occur in other positions: numbers are generally excluded, so an identifier would look like \h\w* or [[:alpha:]_][[:alnum:]_]