javascript regex iso datetime

Question

does anyone have a good regex pattern for matching iso datetimes?

ie: 2010-06-15T00:00:00

Answer 1

Here is a regular expression to check ISO 8601 date format including leap years and short-long months. To run this, you'll need to "ignore white-space". A compacted version without white-space is on regexlib: http://regexlib.com/REDetails.aspx?regexp_id=3344

There's more to ISO 8601 - this regex only cares for dates, but you can easily extend it to support time validation which is not that tricky.

Update: This works now with javascript (without lookbehinds)

  ^(?:
      (?=
            [02468][048]00
            |[13579][26]00
            |[0-9][0-9]0[48]
            |[0-9][0-9][2468][048]
            |[0-9][0-9][13579][26]              
      )

      \d{4}

      (?:

        (-|)

        (?:

            (?:
                00[1-9]
                |0[1-9][0-9]
                |[1-2][0-9][0-9]
                |3[0-5][0-9]
                |36[0-6]
            )
            |
                (?:01|03|05|07|08|10|12)
                (?:
                  \1
                  (?:0[1-9]|[12][0-9]|3[01])
                )?            
            |
                (?:04|06|09|11)
                (?:
                  \1
                  (?:0[1-9]|[12][0-9]|30)
                )?            
            |
                02
                (?:
                  \1
                  (?:0[1-9]|[12][0-9])
                )?

            |
                W(?:0[1-9]|[1-4][0-9]|5[0-3])
                (?:
                  \1
                  [1-7]
                )?

        )            
      )?
  )$
  |
  ^(?:
      (?!
            [02468][048]00
            |[13579][26]00
            |[0-9][0-9]0[48]
            |[0-9][0-9][2468][048]
            |[0-9][0-9][13579][26]              
      )

      \d{4}

      (?:

        (-|)

        (?:

            (?:
                00[1-9]
                |0[1-9][0-9]
                |[1-2][0-9][0-9]
                |3[0-5][0-9]
                |36[0-5]
            )
            |
                (?:01|03|05|07|08|10|12)
                (?:
                  \2
                  (?:0[1-9]|[12][0-9]|3[01])
                )?

            |
                (?:04|06|09|11)
                (?:
                  \2
                  (?:0[1-9]|[12][0-9]|30)
                )?
            |
                (?:02)
                (?:
                  \2
                  (?:0[1-9]|1[0-9]|2[0-8])
                )?
            |
                W(?:0[1-9]|[1-4][0-9]|5[0-3])
                (?:
                  \2
                  [1-7]
                )?
       ) 
    )?
)$

To cater for time, add something like this to the mixture (from: http://underground.infovark.com/2008/07/22/iso-date-validation-regex/ ):

([T\s](([01]\d|2[0-3])((:?)[0-5]\d)?|24\:?00)?(\15([0-5]\d))?([zZ]|([\+-])([01]\d|2[0-3]):?([0-5]\d)?)?)?