\1 match the value of the first capture. : Regular Expressions « Development « VB.Net






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\1 match the value of the first capture.

   

Imports System.Text.RegularExpressions

Module Example
   Public Sub Main()
      Dim pattern As String = "(\w)\1"
      Dim words() As String = { "this", "is", "a", "test"}
      For Each word As String In words
         Dim match As Match = Regex.Match(word, pattern)
         If match.Success Then
            Console.WriteLine("'{0}' found in '{1}' at position {2}.",match.Value, word, match.Index)
         Else
            Console.WriteLine("No double characters in '{0}'.", word)
         End If
      Next                                                  
   End Sub
End Module








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23.\w matches any word character.
24.(\w) matches a word character. This is the first capturing group.
25.\s matches any white-space character.
26.\b: Begin the match at a word boundary.
27.\w+: Match one or more word characters.
28.(e)*: Match an "e" either zero or one time.
29.(\s|$) Match either a whitespace character or the end of the input string.
30.^: Begin the match at the beginning of the input string.
31.\D: Match a non-digit character.
32.\d{1,5} Matches from one to five decimal digits.
33.\D* matches zero or one non-decimal character.
34.$ Matches the end of the input string.
35.\S matches any non-white-space character.
36.\b: Begin the match at a word boundary.
37.(\S+): matches one or more non-white-space characters. This is the first capturing group.
38.\s*: matches zero or one white-space character.
39.Regular expression for class and group
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42.Parse Image tags in a HTML file
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47.ArgumentOutOfRangeException is thrown when the value of an argument is outside the allowable range
48.Capture Class represents the results from a single successful subexpression capture.
49.CharUnicodeInfo Class has information about a Unicode character
50.Validate email address
51.Regex.Split