regex result question

[gs]

is it OK to get regex result of pattern which has duplicate reference names
like
StrDatePattern As String
="\b(((?<year>\d{4})-(?<month>\d{1,2})-(?<day>\d{2}))|{(?<month>\d{1,2})
(?<day>\d{2}), (?<year>\d{4})))"?

my code segment
StrDatePattern As String
="\b(((?<year>\d{4})-(?<month>\d{1,2})-(?<day>\d{2}))|{(?<month>\d{1,2})
(?<day>\d{2}), (?<year>\d{4})))"?
Dim strDate As String = "", _
strYMD As String = ""

Dim r as regex = New Regex(StrDatePattern , RegexOptions.IgnoreCase)
Dim m as match = r.Match(myStringHoldingDateInfo)
If m.Success Then
al_posn = m.Index + 1
strDate = Mid(StringIn, al_posn, m.Length) ' works so far
strYMD = m.Result("${year)-${month}-{$day}") ' at best, I
get the year component only
Else
al_posn = 0
strDate = ""
strYMD = ""
End If

I did not have much luck using match.result to re-arrange the extracted date
string. However I was able to extract the matched date string.
I even try with another match on strYMD and then use that result to
re-arrange
the date string and still no luck.
What did I go wrong?

thank you for your time.

[dfoster]

On 2005-09-04, gs <[e-mail]> wrote:

is it OK to get regex result of pattern which has duplicate reference names
Yes...
like
StrDatePattern As String
="\b(((?<year>\d{4})-(?<month>\d{1,2})-(?<day>\d{2}))|{(?<month>\d{1,2})
(?<day>\d{2}), (?<year>\d{4})))"?
That doesn't compile. What's the '{' character right after the pipe
supposed to do? Regexes get so dense that it's important to copy and
paste the pattern into your post rather than retype it. The smallest
mistake can make your question impossible to answer.

It seems that you want a '(' rather than a '{' there, but that means
you're trying match strings like "12 23, 2005". That's possible, but it
seems like a strange date format.

my code segment
....
Dim m as match = r.Match(myStringHoldingDateInfo)

The obvious question here is what is the input string you're trying to
match. Without that information, it's hard to know what the problem
is.