public void RegexCreateExposesCaptureGroupInfo()
{
//Given
var regex = new Regex("(.+) (?P<foo>.*)");
//When
var numCaptures = regex.CaptureGroupCount;
var fooCaptureId = regex.FindNamedCapture("foo");
var invalidCaptureId = regex.FindNamedCapture("bar");
//Then
Assert.Equal(2, numCaptures);
Assert.Equal(2, fooCaptureId);
Assert.Equal(-1, invalidCaptureId);
}
public void CapturesWithExtractedText()
{
using (var re = new Regex(@"(?P<year>\d{4})-(?P<month>\d{2})-(?P<day>\d{2})"))
{
var haystack = "The first woman in space launched on 1963-06-16 in Vostok 6";
var captures = re.Captures(haystack);
Assert.True(captures.Matched);
// The first capture group is the whole match.
Assert.True(captures[0].Matched);
// Each capture group has position information
Assert.True(captures[1].Matched);
Assert.Equal(37, captures[1].Start);
Assert.Equal(41, captures[1].End);
/// As well as the UTF-8 indices the extracted text is available
Assert.True(captures[2].Matched);
Assert.Equal("06", captures[2].ExtractedText);
// capture group indices can be looked up by name with th `Regex`
Assert.True(captures[re.FindNamedCapture("day")].Matched);
}
}
