| LastIndexOfAny(ReadOnlySpanChar, SearchValuesPolyfillChar, Int32, Int32) | Returns the zero-based index of the last occurrence of one of the specified characters in span. The search begins at a specified character position and runs a specified number of character positions backwards to the beginning of the span. |
| LastIndexOfAny(ReadOnlySpanChar, ReadOnlySpanChar, Int32, Int32) | Returns the zero-based index of the last occurrence of one of the specified characters in span. The search begins at a specified character position and runs a specified number of character positions backwards to the beginning of the span. |