Return sub-strings between certain characters from a long string (de-concatenate)

Hi, I have a string which goes //John/McCormick/25

The slash is used to divide the string into a few parts. Now I would like to return them, i.e. to de-concatenate and retrieve:

*nothing ("") for the first position,
*"John" for the second position,
*"McCormick" for the third position, and
*"25" for the fourth position.

If I was able to retrieve position of slashes within the string, I could use something like this:
*MID(cell, position of the 1st slash, position of the 2nd slash)
*MID(cell, position of the 2nd slash, position of the 3rd slash)
*MID(cell, position of the 3rd slash, position of the 4th slash)
*MID(cell, position of the 4th slash, position of the 5th slash)

hi regresss. assuming your data in A1, try this in B1:
=TRIM(MID(SUBSTITUTE($A1,"/",REPT(" ",100)),100+(COLUMNS($B1:B1)-1)*100,100))

then copy to C1 & D1. it's explained in the file of my link below*Tips & Tutorials I Compiled, sheet 12

Nice and neat solution benishiryo. I will gladly use yours as I expect it to be faster then mine for big data (and I plan to move horizontally). Mine (I have come up with in the meantime):

A1: //John/McCormick/25

=MID(A1,FIND(CHAR(120),SUBSTITUTE(F3,"/",CHAR(120),1))+1,FIND(CHAR(120),SUBSTITUTE(F3,"/",CHAR(120),24))-FIND(CHAR(120),SUBSTITUTE(F3,"/",CHAR(120),1))-1)
=MID(A1,FIND(CHAR(120),SUBSTITUTE(F3,"/",CHAR(120),2))+1,FIND(CHAR(120),SUBSTITUTE(F3,"/",CHAR(120),3))-FIND(CHAR(120),SUBSTITUTE(F3,"/",CHAR(120),2))-1)
=MID(A1,FIND(CHAR(120),SUBSTITUTE(F3,"/",CHAR(120),3))+1,FIND(CHAR(120),SUBSTITUTE(F3,"/",CHAR(120),4))-FIND(CHAR(120),SUBSTITUTE(F3,"/",CHAR(120),3))-1)