How to filter materials

Example filter strings:

filter	meaning
Cu>1	more than 1 Cu atom
gap>1.1	“gap” larger than 1.1
xc=PBE	“xc” equal to “PBE”
MoS2	one or more MoS2 formula units
Mo	same ase Mo>0 or Mo!=0

Strings can be combined with “,” (and) and “|” (or). Grouping can be done using “(” and “)”:

filter	meaning
Au, O=0	contains gold but no oxygen
Cu | Fe	contains Cu or Fe
gap>1.1, (Cu | Fe)	band gap larger than 1.1 and contains Cu or Fe