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