http://office.microsoft.com/cs-cz/excel-help/pouzi ti-overeni-dat-u-bunek-HP010072600.aspx
pouzijes vlastny vzorec (posledna sekcia uplne na konci stranky)

Vlastny vzorec bude kombinacia funkcii napr. AND a FIND (pre kazdy znak jeden FIND, t.j. napr. AND(ISERROR(FIND(".",A1,1)),ISERROR(FIND("/",A1,1) ) ,...)

http://www.techonthenet.com/excel/formulas/find.ph p

The Find function returns the location of a substring in a string. The search is case-sensitive.

The syntax for the Find function is:

Find( text1, text2, start_position )

text1 is the substring to search for in text2.

text2 is the string to search.

start_position is the position in text2 where the search will start. The first position is 1.

Note:

If the Find function does not find a match, it will return a #VALUE! error.