| LastIndexOf(ReadOnlySpanChar, ReadOnlySpanChar, StringComparison) | Specifies the zero-based index of the last occurrence of a specified string in span. A parameter specifies the type of search for the specified string. |
| LastIndexOf(ReadOnlySpanChar, String, StringComparison) | Specifies the zero-based index of the last occurrence of a specified string in span. A parameter specifies the type of search for the specified string. |