Domenic wrote...
Another way...

=IF(OR(ISNUMBER(SEARCH({"/","-"},A1))),LEFT(A1,MIN(SEARCH({"/","-"},
A1&"/-"))-1),A1)
....

If you're going to append "/" and "-" to A1, there's no need for the
error trap.

=LEFT(A1,MIN(FIND({"-","/"},A1&{"-","/"}))-1)