Try it with this slight variation of data:

...
(CELL
  ...
  (TIMINGCHECK
    ....
    ....
  )
)
(CELL
 (CELLTYPE "SEDFQD1")
 (INSTANCE uTrigger/TrcInclCtrlReg_reg[13])
 (DELAY
 (ABSOLUTE
  (IOPATH CP Q (0.10:0.15:0.25)(0.09:0.15:0.24))
 )
 )
 (TIMINGCHECK
   (OTHERTEST
  (SETUP (posedge SI) (posedge CP) (0.14:0.23:0.41))
  (SETUP (negedge SI) (posedge CP) (0.09:0.16:0.30))
  ....(random lines)
  (HOLD (negedge SI) (posedge CP) (0.00:0.00:0.00))
  (HOLD (negedge D) (posedge CP) (0.00:0.00:0.00))
 )
 )
)
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Your code is relying on th happy fortuity of the sample data, that the close of the block is a single ')' on a line by itself. Mine actually counts the parens to determine when the block is closed.

Its a hack, but a useful one.