| LastIndexOfRegEx(String, String, RegexOptions) | Reports the zero-based index position of the last occurrence of a specified string within this instance, using a regular expression. |
| LastIndexOfRegEx(String, String, Int32, RegexOptions) | Reports the zero-based index position of the last occurrence of a specified string within this instance, using a regular expression. |
| LastIndexOfRegEx(String, String, Int32, Int32, RegexOptions) | Reports the zero-based index position of the last occurrence of a specified string within this instance, using a regular expression. |