CFLib.org – Common Function Library Project

Description:
Checks string to see if it is a palindrome. A palindrome is any word or phrase that is the same spelled forwards or backwards. The test performed will ignore spaces and punctuation.

Return Values:
Returns a boolean.

Example:

<cfset mystr = "racecar">
<cfset complex = "Sums are not set as a test on Erasmus">
<cfset bad = "This will not work.">

<cfoutput>
Is "racecar" a Palindrome: #isPalindrome(mystr)#<BR>
Is "Sums are not set as a test on Erasmus" a Palindrome: #isPalindrome(complex)#<BR>
Is "This will not work." a Palindrome: #isPalindrome(bad)#<BR>
</cfoutput>

Parameters:

Full UDF Source:

/**
 * Checks string to see if it is a pPalindrome.
 * Modified by Raymond Camden
 * 
 * @param string      The string to check. 
 * @return Returns a boolean. 
 * @author Douglas Williams (klenzade@i-55.com) 
 * @version 1, November 22, 2001 
 */
function isPalindrome(string) {
  var newstring = rereplacenocase(string, '[^a-z1-9]','', 'ALL');
  return newstring eq reverse(newstring);
}