Get a string in '/' delimited string

Hi,

 I am trying to get after the 5th position of '/' string value.

String value looks like,

/string1/string2/string3/1.1/2.2/string4/ ---- should return 2.2

/string1/string2/string3/1.1/2.4/ ---- should return 2.4

Only way is write a function to get value or any other building function available to get the value.

Thanks.