Add leading zeroes/0's to existing Excel values to certain length
问题 There are many, many questions and quality answers on SO regarding how to prevent leading zeroes from getting stripped when importing to or exporting from Excel. However, I already have a spreadsheet that has values in it that were truncated as numbers when, in fact, they should have been handled as strings. I need to clean up the data and add the leading zeros back in. There is a field that should be four characters with lead zeros padding out the string to four characters. However: "23"