Thanks for your response Naga!
The logic that I need to implement is the following:
1) if [ZCALMTO] contains only one entry that of a "#" then perform some calculation inside a report formula that has noting to do with [ZCALMTO].
2) if [ZCALMTO] contains # followed by a date then pick up the date (ignore the #) and use in a report formula to calculate a date range.
3) if [ZCALMTO] contains multiple dates then pick up the first date and perform the same calculation as above.
All of this could be easily achieve if I were able to restrict # at the Report Selection Formulas but when I restrict # there for case 1 my report becomes blank for most of the fields. If I could count the number of values in [ZCALMTO] in Report Selection Formulas and restrict # for case 2) and 3) my problem would be solved. But apparently Count functions don't work in Report Selection Formulas, and therefore I am trying to extract all the values in [ZCALMTO] in my report formula to implement the stated logic.
Thanks!