+# named-backref Scanned \k
+# Leading to \k<captureName>
+# Failure to get the full sequence is an error.
+#
+named-backref:
+ '<' n named-backref-2 doBeginNamedBackRef
+ default errorDeath doBadNamedCapture
+
+named-backref-2:
+ ascii_letter n named-backref-3 doContinueNamedBackRef
+ default errorDeath doBadNamedCapture
+
+named-backref-3:
+ ascii_letter n named-backref-3 doContinueNamedBackRef
+ digit_char n named-backref-3 doContinueNamedBackRef
+ '>' n expr-quant doCompleteNamedBackRef
+ default errorDeath doBadNamedCapture
+