MultiTextEdit multiTextEdit = (MultiTextEdit) edit;
for (TextEdit child : multiTextEdit.getChildren()) {
if (child instanceof InsertEdit) {
InsertEdit insertEdit = (InsertEdit) child;
if (insertEdit.getText().indexOf(subString) != -1) {
multiTextEdit.removeChild(insertEdit);
}
} else {
removeInsertEdits_forSubString(child, subString);
}
}