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Synopsys:
substr
Given a string and two indices FROM and TO conforming a semi-open interval [FROM,TO), push the substring enclosed by that interval.
Both indexes are zero-based.
If FROM >= the size of the string, or if TO > the size of the string, or if FROM >= TO, raise the PVM_E_OUT_OF_BOUNDS exception.
Stack: ( STR ULONG(from) ULONG(to) -- STR ULONG(from) ULONG(to) STR )
Exceptions: PVM_E_OUT_OF_BOUNDS