CFLib.org – Common Function Library Project

Description:
Tests passed value to see if it is a properly formatted U.S. zip code. Does not check actual validity/existence of zip code!

Return Values:
Returns a boolean.

Example:

<cfoutput>
#YesNoFormat(IsZipUS("48084"))#<br>
#YesNoFormat(IsZipUS("90210"))#<br>
#YesNoFormat(IsZipUS("02412-0356"))#<br>
#YesNoFormat(IsZipUS("ABC1234"))#<br>
</cfoutput>

Parameters:

Full UDF Source:

/**
 * Tests passed value to see if it is a properly formatted U.S. zip code.
 * 
 * @param str      String to be checked. (Required)
 * @return Returns a boolean. 
 * @author Jeff Guillaume (jeff@kazoomis.com) 
 * @version 1, May 8, 2002 
 */
function IsZipUS(str) {
    return REFind('^[[:digit:]]{5}(( |-)?[[:digit:]]{4})?$', str); 
}