check string format in sql

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Hi all,

I need to do a check in sql - to find wheteher the supplied string is in the form 'YYYYMMdd'

please help me to do this.

@datepart varchar(10) 
@datepart = '20130611'

i need to check the @datepart is in the form - YYYYMMdd.

Thanks in advance,

Posted 23-Jun-13 22:53pm

SruthiR

Updated 23-Jun-13 22:54pm

Rajesh Anuhya

v2

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2 solutions

Solution 2

Check bellow e.g

SQL

IF ISDATE('20130611') = 1
    PRINT 'VALID'
ELSE
    PRINT 'INVALID'

Posted 24-Jun-13 0:15am

Mukesh Ghosh

Comments

SruthiR 24-Jun-13 6:34am

this checks only if the string is datestring. But i need to find the format YYYYMMDD.

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Maciej Los · Accepted Answer · 2013-06-23T23:40:00

You can do it using Regex[^].
Have a look here:
Regular Expressions Make Pattern Matching And Data Extraction Easier[^]
Search Text with Regular Expressions[^]
Working with Regular Expressions[^]

Another way is to define pattern with LIKE[^] and PATINDEX[^] keyword:
Pattern Matching in Search Conditions[^]

Or
Using CONVERT[^] function ;)
Example:

SQL

DECLARE @myStringDates TABLE (myDate VARCHAR(30))

INSERT INTO @myStringDates (myDate)
SELECT '20130618' AS myDate
UNION ALL SELECT '18062013'
UNION ALL SELECT '06182013'

SELECT myDate
FROM @myStringDates
WHERE (CONVERT(INT, LEFT(myDate,4)) BETWEEN 1901 AND 2013) AND
	(CONVERT(INT, SUBSTRING(myDate,5,2)) BETWEEN 1 AND 12) AND
	(CONVERT(INT, SUBSTRING(myDate,7,2)) BETWEEN 1 AND 31)

Result:

20130618