[Bug-XBoard] [bug #27799] fix for nested-nested-nested variations

[Tim Mann]

Follow-up Comment #13, bug #27799 (project xboard):

Of course you are right about regular expressions not being able to handle
nesting -- what is in parser.l now is a kludge.  I had vague thoughts at one
time about recognizing {, }, (, and ) as individual tokens and handling
nesting (including a subvariation tree!) in the back end.  That never went
anywhere.


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