TryCF Gist

trycf-gist-1773251897766-11c954f5-37fd-bc7d-1a10-e100c00c881a.cfm

<cfscript>
rc = {
    "key0": "hello%252520world87%%20test",
    "key1": "hello%252520world",
    "key2": "hello%2520world 87%25",
    "key2": "hello%2520world 87%"
}

rc.each( (key, value ) => {
 if ( !isNull( value ) && isSimpleValue( value ) ) {
     try{
         rc[key] = urlDecode( urlDecode( rc[key].toString() ) );
     } catch( any error ){
        dump( "URL_DECODE_WARNING :: Key #key# :: #error.message# :: Manually decoding" );
            
        rc[key] = reReplace( rc[key].toString(), "%(?![0-9A-Fa-f]{2})", "%2525", "all" );
        if ( reFind( "%[0-9A-Fa-f]{2}", rc[key] ) ) rc[key] = urlDecode( rc[key] );
  
        rc[key] = reReplace( rc[key], "%(?![0-9A-Fa-f]{2})", "%2525", "all" );
        if ( reFind("%[0-9A-Fa-f]{2}", rc[key] ) ) rc[key] = urlDecode( rc[key] );
     }
 }
} );


dump( rc ) 
</cfscript>