Polygon self intersection. Correcting the geometry of overlapping polygons in the same layer in QGIS

Polygon self intersection.
Correcting the geometry of overlapping polygons in the same layer in QGIS
Regular Expression used in Video

1. if(regexp_match("ID",'\\|') > 0, regexp_substr("ID",'[^|]*'), "ID")

2. if(regexp_match("ID",'\\|') > 0, regexp_substr("ID",'(?<=\\|).*'), "ID")

Note : Replace > with greater than symbol, similarly < with less than symbol.

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