Question

I have a excel file that must have this name format, where xxx is a number, Curr is either EUR or GBP and yymmdd is a date.

CDFSDDRCxxxCurryymmdd.xls(x)

And this is the regex I’m using. It doesn´t works with dates like 120920 or 121005.
Any Ideas??

Match nameIsValid = Regex.Match(activeWorkbook.Name,
                                      @"CDFSDDRC(?<xxx>\d+)(?<curr>EUR|GBP)(?<yymmdd>\d{2}(?:0[1-9]|1[12])(?:(?:0|1|2)[1-9]|3[0-2]))\.xls?");

Answer 1

A quick fix for this regex would be the following one:

CDFSDDRC(?<xxx>\d+)(?<curr>EUR|GBP)(?<yymmdd>\d{2}(?:0[1-9]|1[012])(?:(?:0|1|2)[0-9]|3[0-2]))\.xls?

You can check out the results here.

Note that this one will match if the day of the month is 00.

My opinion is that you should not be checking for a valid days, months and years in your regex. You can match a 6-digit date by using the following, much simpler regex:

CDFSDDRC(?<xxx>\d+)(?<curr>EUR|GBP)(?<yymmdd>\d{6})\.xls?

After you match it, you can then programmatically check whether it’s a valid date or not.