[libreoffice-users] finding duplicates in a column in Calc

I sometimes import a load of data into a column and am looking for a way to detect duplicates. The 
data is mostly alpha but could contain some digits.

At present, I sort the data in the column alphabetically and then manually inspect for duplicates. 
But with some data, I don't want to do an alpha sort.

I don't find any way in Calc's menus to do this and the online help gives nothing for 'duplicates'. 
Maybe someone has an idea of a regex that could be used ?

Philip


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