How to find strings in an excel file?

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Diana
Diana 2013-4-8
I want to find all colons in an excel file
colons = findstr(char, ':');
colons shows up empty. why is that?

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Diana
Diana 2013-4-9
Thanks for your reply
Yes, I did.
I also tried
colons = findstr(string, ':');
Any idea of what could be wrong?
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Yao Li
Yao Li 2013-4-11
sorry, I think it is not good to use string as the name of the variable.
find(strcmp(':',text_load_from_Excel ))
text_load_from_Excel is a cell type variable loaded from the Excel file
Diana
Diana 2013-4-15
No worries. Can you explain to me what a cell type variable is?

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