/// <summary>
/// Capture index number 0 is the entire match. Capture
/// index 1 is the first matched group from the left, and so on.
/// </summary>
/// <param name="input">The input.</param>
/// <param name="regularExpression">The regular expression.</param>
/// <param name="captureIndex">Index of the capture.</param>
/// <param name="options">The options.</param>
/// <returns></returns>
public static string Extract(string input, string regularExpression, int captureIndex, RegexOptions options)
{
Match m = Regex.Match(input, regularExpression, options);
if (m.Success)
{
return(RegexUtilities.GetCapture(m, captureIndex));
}
return(null);
}
private static bool DoParse(string str, TzTimeZone localTimeZone, out TzDateTime result)
{
result = null;
if (string.IsNullOrEmpty(str))
{
throw new ArgumentNullException("str");
}
Match m;
int matchIndex = RegexUtilities.MatchAny(str, out m,
FormatYear,
FormatYearAndMonth,
FormatComplete,
FormatCompleteHM,
FormatCompleteHMS,
FormatCompleteHMSF);
int year = 0, month = 1, day = 1, hours = 0, minutes = 0, seconds = 0, millisecond = 0;
DateTimeKind kind = DateTimeKind.Local;
TzTimeZone timezone = localTimeZone;
if (matchIndex != -1)
{
if (matchIndex >= 0)
{
year = int.Parse(RegexUtilities.GetCapture(m, 1));
}
if (matchIndex >= 1)
{
month = int.Parse(RegexUtilities.GetCapture(m, 2));
}
if (matchIndex >= 2)
{
day = int.Parse(RegexUtilities.GetCapture(m, 3));
}
if (matchIndex >= 3)
{
hours = int.Parse(RegexUtilities.GetCapture(m, 4));
minutes = int.Parse(RegexUtilities.GetCapture(m, 5));
// At this level, we also expect a time zone designator
kind = DateTimeKind.Utc;
string tzd = RegexUtilities.GetLastCapture(m, 2);
if (tzd == UtcZuluIdentifier.ToString())
{
timezone = TzTimeZone.ZoneUTC;
}
else
{
timezone = TzTimeZone.GetTimeZoneByOffset(RegexUtilities.GetLastCapture(m, 1));
}
}
if (matchIndex >= 4)
{
seconds = int.Parse(RegexUtilities.GetCapture(m, 6));
}
if (matchIndex >= 5)
{
millisecond = int.Parse(RegexUtilities.GetCapture(m, 7));
}
result = new TzDateTime(year, month, day, hours, minutes, seconds, millisecond, kind, timezone);
return(true);
}
return(false);
}