String Functions For Flash

I have worked on a .as file containing string functions for a few days just going over it to see if it is all optimized...

Function List:
-rot_13
-str_shuffle
-str_ipos
-str_ireplace
-str_pad
-str_parse
-str_pos
-str_replace
-str_slash
-substr_replace

I am still wondering if it is perfectly optimized for all parts or if there is room for any improvement. So I need some people here willing to check it out...

You can check out the beta here: http://www.cubedstudios.com/String_Functions.as

-----Soccr743-----

PS: If you plan to use this script in any flash project give credit when you can :)