usefiltermodel.py

from PySide2.QtCore import QSortFilterProxyModel, Qt, QRegExp

class FilterModelU(QSortFilterProxyModel):
    def __init__(self,data ,parent=None):
        QSortFilterProxyModel.__init__(self, parent)
        self.displayed=[]
        self.fileType=[]

    def filterAcceptsRow(self,source_row, source_parent):
        if len(self.sourceModel().metadataList) > source_row:
            curSource = self.sourceModel().metadataList[source_row]['Source']
            if "Custom Input" not in curSource:
                splitSource= "/".join(curSource.split("/")[1:])
                if splitSource in self.sourceModel().templatesources:
                    if self.sourceModel().metadataList[source_row] not in self.displayed:
                        self.displayed.append(self.sourceModel().metadataList[source_row])
                    return True
                else:
                    return False
            else:
                if self.sourceModel().metadataList[source_row] not in self.displayed:
                    self.displayed.append(self.sourceModel().metadataList[source_row])

                return "Custom Input" in self.sourceModel().metadataList[source_row]['Source']
        else:
            return False