RegEX cannot match in vb.net

Question

I need to find the folder name with special word. My code doesn't work. Would someone tell me how to solve it. I want the folder name with or without () would be fine. I am not sure how many digit in the blanket. There are example:

C:\test\REG33006\2017-03-09
C:\test\REG33006\2017-03-09(1)
C:\test\REG33006\2017-03-09(100)

There is my code in vb:

 Dim Dir as string="C:\test\REG33006\2017-03-09(1)"
 Dim patt As String ="^C:\\test\REG33006\\2017-03-09\(*\d*\)*$"
 Dim regex As Regex = New Regex(patt)
 Dim match As Match = regex.Match(Dir)
     If match.Success Then
         If Dir.Contains(")") Then
             Dim indexStart As Integer = Dir.IndexOf("(")
               maxNumber = CInt(Dir.Substring(indexStart + 1, Dir.Length -  indexStart))


         End If
     End If

Try with a capturing group - "^C:\\test\REG33006\\2017-03-09(?:$(\d*)$)?$" -> If match.Success Then maxnumber = match.Group(1).Value — Wiktor Stribiżew
– Wiktor Stribiżew, Commented Mar 9, 2017 at 15:12

Robert L. · Accepted Answer · 2017-03-09 15:22:29Z

1

The parenthesis define a capturing group. You can use sth like

    dim patt as string = "C:\\test\\REG33006\\2017-03-09\((.*)\)"
    if match.success then
         result = match.groups(1).value

edited Mar 9, 2017 at 15:22

answered Mar 9, 2017 at 15:16

Robert L.

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Wiktor Stribiżew · Accepted Answer · 2017-03-09 20:49:00Z

0

You may use

 Dim regex As Regex = New Regex("^C:\\test\\REG33006\\2017-03-09(?:\(([0-9]*)\))?$")
 Dim match As Match = regex.Match(Dir)
 If match.Success Then
     maxnumber  = match.Group(1).Value
 End If

The regex matches:

^ - start of a string
C:\\test\\REG33006\\2017-03-09 - a literal char sequence C:\test\REG33006\2017-03-09
(?:$([0-9]*)$)? - an optional (1 or 0 times) sequence of:
- $ - a (
- ([0-9]*) - Group 1 (its value is retrieved with match.Group(1).Value): zero or more digits
- $ - a )
$ - end of string,

answered Mar 9, 2017 at 20:49

Wiktor Stribiżew

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1 Comment

Wiktor Stribiżew Over a year ago

Note that \d is different from [0-9] in .NET regex (by default).

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