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Field Calc - First two characters of a string check

Question asked by wtgeographer on Feb 11, 2014
Latest reply on Feb 12, 2014 by hua17
I have a large dataset with field named 'MAP_NUMBER' in which should contain values of A1-A29, B1-B29 and so forth... Many of the records contain values similar to 'YY29' and should just be 'Y29' .  How can I check the second character against the first (which should never be duplicate) and make corrections in the field calculator using python?

Thanks in advance.