matches the empty string, but only at the beginning of a symbol.
A symbol is a sequence of one or more symbol-constituent characters.
A symbol-constituent character is a character whose syntax is either
-@vsamp{w} or @samp{_}. @samp{\_<} matches at the beginning of the
+@samp{w} or @samp{_}. @samp{\_<} matches at the beginning of the
buffer only if a symbol-constituent character follows.
@item \_>