public static string SubstrAfterLast(this string input, string seq, SubstrOptions opts = SubstrOptions.Default) {
if (input?.Length > 0 && seq?.Length > 0) {
int index = input.LastIndexOf(seq, (opts & SubstrOptions.IgnoreCase) > 0 ? StringComparison.OrdinalIgnoreCase : StringComparison.Ordinal);
if (index >= 0) {
if ((opts & SubstrOptions.IncludeSeq) == 0) { index += seq.Length; }
return input.Substring(index);
}
}
return (opts & SubstrOptions.RetInput) > 0 ? input : null;
}
public static string SubstrAfterLast(this string input, string[] sequences, SubstrOptions opts = SubstrOptions.Default) {
if (input?.Length > 0 && sequences?.Length > 0) {
int idx = 0;
for (int i = 0; i < sequences.Length; i++) {
string seq = sequences[i];
if (seq?.Length > 0) {
int pos = input.LastIndexOf(seq, idx, idx, (opts & SubstrOptions.IgnoreCase) > 0 ? StringComparison.OrdinalIgnoreCase : StringComparison.Ordinal);
if (pos >= idx && pos <= input.Length) {
if ((opts & SubstrOptions.IncludeSeq) == 0) { pos += seq.Length; }
idx = pos;
}
}
}
return input.Substring(idx);
}
return (opts & SubstrOptions.RetInput) > 0 ? input : null;
}