Regular Expressions

([a-zA-z]{100}\d{6}[a-zA-Z]{1,})

[a-zA-Z]{1,100}-\d{6}_[a-zA-Z]{1,}

-\d{6}_

Public Function Verify(ByVal myFileName As String)<br />
       Dim Pattern As String = "-d{6}_"<br />
       '"([a-zA-z]{100}\d{6}[a-zA-z]{1,})"<br />
       Dim MyRegex As New RegularExpressions.Regex(Pattern, RegularExpressions.RegexOptions.IgnoreCase)<br />
       Return MyRegex.IsMatch(myFileName, 0)<br />
   End Function

 If Verify("Granic-012345_Test-Granic.txt") Then  ' should be valid<br />
            MessageBox.Show("valid")<br />
        Else<br />
            MessageBox.Show("Not valid")<br />
        End If<br />
        If Verify("TESTTING-123456-Norman_NDtest1.dat") Then ' should be not valid<br />
            MessageBox.Show("valid")<br />
        Else<br />
            MessageBox.Show("Not valid")<br />
        End If<br />
        If Verify("GRANIC-123456_jayson.xls") Then ' should be not valid<br />
            MessageBox.Show("valid")<br />
        Else<br />
            MessageBox.Show("Not valid")<br />
        End If<br />
        If Verify("incoming-testfile.txt") Then  ' should be not valid<br />
            MessageBox.Show("valid")<br />
        Else<br />
            MessageBox.Show("Not valid")<br />
        End If<br />
<br />
        If Verify("Testing-474948_filename.txt") Then ' should be valid<br />
            MessageBox.Show("valid")<br />
        Else<br />
            MessageBox.Show("Not valid")<br />
        End If

^\D{5}\-\d{6}_\D{1,}$

aaaaa-666666_a

^[^"]*("[^"]*")*[^"]*$

http://www\.google\.com\?(?<QUERY_STRING>.*)

http://www\.google\.com(?=\?)

http://www\.google\.com\??

\<img\>.*?\</img\>

//  using System.Text.RegularExpressions;

/// <summary>
///  Regular expression built for C# on: Mon, Sep 6, 2010, 12:26:15 PM
///  Using Expresso Version: 3.0.3634, http://www.ultrapico.com
///  
///  A description of the regular expression:
///  
///  <%
///      <%
///  Any character that is NOT in this class: [\"], any number of repetitions
///  "
///  [InQuotes]: A named capture group. [.*]
///      Any character, any number of repetitions
///  Match a suffix but exclude it from the capture. [\"]
///      Literal "
///  Any character that is NOT in this class: [%], any number of repetitions
///  %>
///      %>
///  
///
/// </summary>
public static Regex regex = new Regex(
      "<%[^\\\"]*\"(?<InQuotes>.*)(?=\\\")[^%]*%>",
    RegexOptions.IgnoreCase
    | RegexOptions.CultureInvariant
    | RegexOptions.IgnorePatternWhitespace
    | RegexOptions.Compiled
    );


// This is the replacement string
public static string regexReplace = 
      "<Hello>";


//// Replace the matched text in the InputText using the replacement pattern
// string result = regex.Replace(InputText,regexReplace);

//// Split the InputText wherever the regex matches
// string[] results = regex.Split(InputText);

//// Capture the first Match, if any, in the InputText
// Match m = regex.Match(InputText);

//// Capture all Matches in the InputText
// MatchCollection ms = regex.Matches(InputText);

//// Test to see if there is a match in the InputText
// bool IsMatch = regex.IsMatch(InputText);

//// Get the names of all the named and numbered capture groups
// string[] GroupNames = regex.GetGroupNames();

//// Get the numbers of all the named and numbered capture groups
// int[] GroupNumbers = regex.GetGroupNumbers();