Input can be specified as a column reference or a string literal, although string literal usage is rare.

• A column reference can refer to a column of String, Object, or Array type, which makes the RIGHTFIND function useful for filtering data before it has been completely un-nested into tabular data.
• Starting location is specified from the end of the string.
• Returned value is from the beginning of the string, regardless of the string index value.
• If no match is found, the function returns a null value.
• If you need to determine if a value is in an array or not, you can use the MATCHES function, which returns a true/false response. See MATCHES Function.

You can also search a string from the left. For more information, see FIND Function.

Column reference example:

Output: Searches the MyName column value for the last instance of the string find this from the end of the value, ignoring case. If a match is found, the index value from the beginning of the string is returned.

String literal example:

Output: Searches the string Hello, World for the string lo, in a case-sensitive search from the third-to-last character of the string. Since the match is found at the fourth character from the left, the value 3 is returned.

If example:

Output: Searches the SearchPool column value for the string FindIt from the end of the value (default). Default behavior is to not ignore case. If the string is found, the value found it is returned. Otherwise, the value is empty.

column_string

Name of the item to be searched. Valid values can be:

• String literals must be quoted ( 'Hello, World' ).
• column reference to any type that can be inferred as a string, which encompasses all values. 

Missing values generate the start-index parameter value.

• Multiple values and wildcards are not supported.

string_pattern

String literal or pattern to find. This value can be a string literal, a , or a regular expression.

• Missing string or column values generate the start-index parameter value.
  
  • String literals must be quoted ('Hello, World').
• Multiple values and wildcards are not supported.

ignore_case

If true, the RIGHTFIND function ignores case when trying to match the string literal or pattern value.

Default value is false, which means that case-sensitive matching is performed by default.

start_index

The index of the character in the column or string literal value at which to begin the search, from the end of the string. For example, a value of 2 instructs the RIGHTFIND function to begin searching from the third character in the column or string value.

• Value must be a non-negative integer value.

• If this value is greater than the length of the string, then no match is possible.

Example - Locate filenames in a URL

In this example, you must extract filenames from a column of URL values. Some rows do not have filenames, and there is some variation in the structure of the URLs.

Source:

Transformation:

To preserve the original column, you can use the following to create a working version of the source:

You can use the following to standardize the formatting of the working column:

The next two steps calculate where in the filename values the forward slash and dot values are located, if at all:

If either of the above values is 0, then there is no filename present:

Results:

After removing the intermediate columns, you should end up with something like the following: