Functions and Directives Functions and Directives

Function RAt() Foundation

Determines the position of last occurrence of a substring within a character string.

Syntax
RAt( <cSeek>, <cString>, [<nStartPos>] ) --> nPosition
Parameters
<cSeek>
<cSeek> is a character or a string whose position in <cString>is determined.
<cString>
<cString> is the character string searched.
<nStartPos>
The optional numeric parameter <nStartPos> defines the position within <cString> to start the search from. It defaults to Len(<cString>).
Return

RAt() searches the character string <cString> from the end (from the right) and returns the last position of <cSeek> as an integer numeric value. When <cSeek> is not found in <cString>, the return value is zero.

Description

The character function RAt() determines the last position of a character substring within another character string. <cString> is searched from the right. The counterpart of RAt() is the function At() which searches a character string from the left (beginning) and determines the position of the first occurrence of a character substring within another character string. The $ operator is also similar and tests whether or not a character string is contained within another.

The functions RAt() and At() are often used in connection with the functions SubStr(), Left() or Right() to perform character string operations.

Examples
RAt() 

// The example determines the path name from a 
// complete file name. 

PROCEDURE Main 
   LOCAL cFileName := "C:\XBASE\APPS\DBF\CUSTOMER.DBF" 

   ? PathName( cFileName ) 

RETURN 

FUNCTION PathName( cFileName ) 
   LOCAL cPathName := "" 
   LOCAL nPosition := RAt( "\", cFileName ) 

   IF nPosition > 0 
      cPathName := Left( cFileName, nPosition ) 
   ENDIF 

RETURN cPathName
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