Validate only month using Regex

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hi all

string item1 = "06/14/2012";(MM/dd/yyyy)formate

//this is validate the year using Regex
 if (Regex.IsMatch(date, @".*/\s*2012", RegexOptions.CultureInvariant))
{
//adding year
}
//if i want to validate month how can i do.?
//in item1 is datetime.
//if i validate item1 how can i know this is particular month
//?

in item1 is datetime.
if i validate item1 how can i know this is particular month?

here i want to validate only months using Regex.

how can i do this functionality.

let me know......

Posted 14-Jun-12 1:35am

U@007

Updated 14-Jun-12 1:51am

v2

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4 solutions

Solution 1

You can use this regex for validating month: "^(0?[1-9]|1[012])$"

Posted 14-Jun-12 1:46am

Vani Kulkarni

Comments

U@007 14-Jun-12 7:50am

hi vani Kulkarni

in item1 is datetime.
if i validate item1 how can i know this is particular month?

Solution 4

Hi,

Best way of validating date is to use Parse, TryParse or TryParseExact instead validating through string.

you can use something like,

C#

string date = "12/12/2012";
DateTime result = default(DateTime);
DateTime.TryParse(date, out result);

after getting datetime in result , you can fetch anything from parsed date.

Thanks
-Amit

Posted 14-Jun-12 1:52am

AmitGajjar

v2

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Manas Bhardwaj · Accepted Answer · 2012-06-14T01:50:00

Solution 2

Why not use the DateTime.TryParseExact[^] method to validate the date.

C#

string date = "06/14/2012"; //(MM/dd/yyyy)format
            DateTime dateResult;

            if (DateTime.TryParseExact(date, "MM/dd/yyyy", CultureInfo.InvariantCulture, DateTimeStyles.None, out dateResult))
            {
                Console.WriteLine("This is a valid date.");
            }

Posted 14-Jun-12 1:50am

Manas Bhardwaj

Updated 14-Jun-12 1:51am

v3

Comments

U@007 14-Jun-12 7:52am

hi Manas bhardwaj

in item1 is datetime.
if i validate item1 how can i know this is particular month?

AmitGajjar 14-Jun-12 7:54am

using dateResult.Month

U@007 14-Jun-12 8:39am

Thank U bhardwaj
5+.

VJ Reddy 14-Jun-12 8:49am

Good answer. 5!

Manas Bhardwaj 14-Jun-12 9:36am

thx!

Espen Harlinn 14-Jun-12 17:12pm

Nice answer, 5'ed!

Manas Bhardwaj 15-Jun-12 3:26am

thanx!

OriginalGriff · Accepted Answer · 2012-06-14T01:51:00

Solution 3

I wouldn't use a regex at all - it is a whole lot easier to validate the lot with a DateTime.tryParseExact:

C#

string s = "06/14/2012";
DateTime dt;
if (DateTime.TryParseExact(s, "MM/dd/yyyy", CultureInfo.InvariantCulture, DateTimeStyles.None, out dt))
    {
    }

Anything you don't specify in the format string will be defaulted.

Posted 14-Jun-12 1:51am

OriginalGriff

Comments

U@007 14-Jun-12 7:53am

hi OriginalGriff

in item1 is datetime.
if i validate item1 how can i know this is particular month?

OriginalGriff 14-Jun-12 8:07am

item1 is a string containing a string representation of a date - it is not a DateTime which is a specific .NET classs to handle dates. If you parse it to a DateTime, then you can get all of the information you want via the DateTime properties. These include Month, Year, Day and also allow you to compare two dates directly, or subtract one from the other to get the TimeSpan interval.
It is well worth converting to a DateTime as early as possible, and converting back to a string as late as possible - doing comparisons and math on string based dates is a pain in the arse! :laugh:

U@007 14-Jun-12 8:40am

yah it's obviously right mr originalgriff
Thank U my side
5+.

OriginalGriff 14-Jun-12 9:29am

You're welcome!

Manas Bhardwaj 14-Jun-12 7:54am

ditto +5!

VJ Reddy 14-Jun-12 8:50am

Good answer. 5!