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Treepat is a language to recognise patterns in trees in a similar way as regular expressions recognize patterns in strings. Treepat includes analogous operators to regex union, concatenation, and closure, which are extended to the notion of trees.
OR_SIGN=2
NUMBER_SIGN=5
PAR_CLOSE=4
AT_SIGN=6
NEWLINE=9
DOT=1
PAR_OPEN=3
ASTERISK=7
ID=8
WS=10
'.'=1
'|'=2
'*'=7
')'=4
'('=3
'#'=5
'@'=6