// don't allow regex as _id: SERVER-9502

var testColl = db.regex_not_id;
testColl.drop()

assert.writeOK(testColl.insert({ _id: "ABCDEF1" }, {writeConcern:{w:1}}));

// Should be an error.
assert.writeError(testColl.insert({ _id: /^A/ }, {writeConcern:{w:1}}));

// _id doesn't have to be first; still disallowed
assert.writeError(testColl.insert({ xxx: "ABCDEF", _id: /ABCDEF/ }, {writeConcern:{w:1}}));