ftsTerm function
Implementation
String ftsTerm(String string) {
if (string.contains(ftsTermJoiner)) ////
log.severe("ftsTerm: \"$string\" contains ftsTermJoiner");
String joined = string.replaceAll(reFtsSpaces, ftsTermJoiner);
return reFtsTermToken.allMatches(joined).map((var m) => m.group(0)!).join();
}