Hello!
Capturing group name can be used in a regular expression in two
contexts: When introducing a group (?...) or when referring it
\k.
If the name is invalid (i.e. does not start with a Latin letter, or
contains wrong chars) then we may see different error messages, some of
which look con
Hi Ivan,
The code handles group name was added later. So "historically" those cases
trigger "unknow look-behind group" when the first character after "<" is not
"=" or "?". With the addition of the group name support, it's actually
hard to
say which one is more accurate, incorrect group name or