Consider a tab-delimited text file, in which a given field may contain a string with commas, e.g.
Matlab's "readtable" function with delimiter=\t will parse the third field ("C,D,E") into multiple lines, rather than treating it as one field.
That is, the command:
readtable( filename, 'FileType', 'text', 'Delimiter', '\t', 'ReadRowNames', 0 , 'ReadVariableNames', 0)
will NOT return a table with the 3rd column/Variable having value "C,D,E" but rather split that field into multiple lines/entries (very strange).