CFLib.org – Common Function Library Project

Description:
Returns the last index of an occurrence of a substring in a string from a specified starting position. (The reverse of find).

Return Values:
Returns the last position where a match is found, or 0 if no match is found.

Example:

<CFSET STR = "//// This is the test, the / test of all tests.">
<CFSET STR2 = "Ray's World">
<CFOUTPUT>
Test: #RFind("/",STR)#<BR>
Test2: #RFind("/",STR2)#<BR>
</CFOUTPUT>

Parameters:

Full UDF Source:

/**
 * Returns the last index of an occurrence of a substring in a string from a specified starting position.
 * Big update by Shawn Seley (shawnse@aol.com) -
 * UDF was not accepting third arg for start pos 
 * and was returning results off by one.
 * Modified by RCamden, added var, fixed bug where if no match it return len of str
 * 
 * @param Substr      Substring to look for. 
 * @param String      String to search. 
 * @param SPos      Starting position. 
 * @return Returns the last position where a match is found, or 0 if no match is found. 
 * @author Charles Naumer (cmn@v-works.com) 
 * @version 2, February 14, 2002 
 */
function RFind(substr,str) {
  var rsubstr  = reverse(substr);
  var rstr     = "";
  var i        = len(str);
  var rcnt     = 0;

  if(arrayLen(arguments) gt 2 and arguments[3] gt 0 and arguments[3] lte len(str)) i = len(str) - arguments[3] + 1;

  rstr = reverse(Right(str, i));
  rcnt = find(rsubstr, rstr);

  if(not rcnt) return 0;
  return len(str)-rcnt-len(substr)+2;
}