I need to check a Regular expression

Question

I have a excel file that must have this name format, where xxx is a number and yymmdd is a date. Only xxx and yymmdd change, the rest is always the same.

CDFSDDRCxxxCurryymmdd.xls

What is a regex I can use to check if it is correct??

http://stackoverflow.com/questions/8647893/regular-expression-leap-years-and-more is a good start, but I don't recommend using regex to validate dates. — Roger Lindsjö, Sep 03 '12 at 14:48

score 3 · Answer 1 · answered Sep 03 '12 at 14:06

3

Try with following regex:

^CDFSDDRC\d{3}Curr\d{6}\.xls$

answered Sep 03 '12 at 14:06

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score 0 · Accepted Answer · answered Sep 03 '12 at 14:49

In C# I think you can try something like this :

"CDFSDDRC(?<xxx>[0-9]+)Curr(?<yymmdd>[0-9][0-9][0|1][0-9][0-3][0-9])\.xls"

But you will have to check matches.Groups["yymmdd"].value once more to check for special cases such as CDFSDDRC123Curr321539.xls that match but contains an incorrect date.

score 0 · Answer 3 · answered Sep 04 '12 at 08:03

I think the following should work.

CDFSDDRC\d[3]Curr(([0-9]{2}(0[13578]|1[02])(0[1-9]|[12][0-9]|3[01]))|([0-9]{2}(0[469]|1[1])(0[1-9]|[12][0-9]|30))|([0-9]{2}(02)(0[1-9]|1[0-9]|2[0-8]))|((((04|08|[2468][048]|[13579][26]))|00)(02)29))\.xsl

I think that you have to escape the backslashes in the C# string.

"CDFSDDRC\\d[3]Curr(([0-9]{2}(0[13578]|1[02])(0[1-9]|[12][0-9]|3[01]))|([0-9]{2}(0[469]|1[1])(0[1-9]|[12][0-9]|30))|([0-9]{2}(02)(0[1-9]|1[0-9]|2[0-8]))|((((04|08|[2468][048]|[13579][26]))|00)(02)29))\\.xsl"

I need to check a Regular expression

3 Answers3