| IndexOfRegEx(String, String, RegexOptions) | Reports the zero-based index of the first occurrence of the specified string in this instance, using a regular expression. |
| IndexOfRegEx(String, String, Int32, RegexOptions) | Reports the zero-based index of the first occurrence of the specified string in this instance, using a regular expression. |
| IndexOfRegEx(String, String, Int32, Int32, RegexOptions) | Reports the zero-based index of the first occurrence of the specified string in this instance, using a regular expression. |