Regular Expression Question Complexity like MS Word Printing

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I have text box for Question Complexity,and
Valid Cases :
Case #01 : 1,2,5,7,9
Case #02 : 3-5
Case #03 : 1,2,5-7

In Valid Case 01 (bold): 1,4,5-7-8
In Valid Case 02 : 2-4-6-8, Correct way is 2-8

Here numbers are complexities of question.The algorithm will generate question according to selected question complexity.

For example in Case #02 ( all questions with complexity of 3,4 and 5 will be selected)
and
For Case #03 ( all question with complexity 1,2 and 5,6,7 will be selected)

my Tested regular expression after lots of testing is

\d+(,\d|(-\d+)(,\d+))*

but there is a problem
it is solving the problem and handling ( ex 2-5-7 ) but it requires (,digit) in the end aswell.

for testing regular expression online you can visit : regular expression online testing

Please can some one help me in this. i need to validate complexity like Microsoft Word Printing options.
Or any link or reference will be helpful. Thanks

Posted 26-Jul-12 6:55am

Anwar Mehmood

Updated 26-Jul-12 6:58am

v2

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Kenneth Haugland 26-Jul-12 13:05pm

Whats the problem with \d+\-\d+ ?

2 solutions

Solution 2

How about a named capture group:

C#

(?<many>\d+(\-\d+)+)|(?<one>(?<=^|,)\d+(?=$|,))

Its basic usage is this:

VB

Private Function GetPages(ByVal input As String) As List(of Integer)
    Dim output as New List(of Integer)
    Dim Number As String = "(?<many>\d+(\-\d+)+)|(?<one>(?<=^|,)\d+(?=$|,))"

    For Each Match As Match In Regex.Matches(input, Number)
       
        If Not Match.Groups("many").Value = String.Empty Then
                'Her you will have a span of several pages 3-6
                dim temp() as string = Match.Groups("many").Value.ToString.Split("-")
                For i as integer = temp(0) to temp(temp.count-1)
                    output.add(i)
                next
        ElseIf not Match.Groups("one").Value = String.Empty Then
               Output.Add(Cint(Match.Groups("one").Value.ToString))
        End If
    Next

    Return output
End Function

You can see more fanzy stuff with regex here:
Evaluate Complex and Real Math Calculator[^]

Posted 26-Jul-12 7:18am

Kenneth Haugland

Updated 26-Jul-12 8:07am

v6

Comments

Anwar Mehmood 26-Jul-12 13:49pm

Thankful to you for time and answer, can you explain a bit about named capture group!

Kenneth Haugland 26-Jul-12 14:09pm

By updating my answer I hope you understand it better :) If not then give me a reply.

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lewax00 · Accepted Answer · 2012-07-26T07:06:00

Solution 1

^(\d+|\d+-\d+)(,(\d+|\d+-\d+))*$
Seems to work. But remember, this would also allow for a range like "100-3", which you may not want, so you might need some extra error checking in your code.

Posted 26-Jul-12 7:06am

lewax00

Comments

Anwar Mehmood 26-Jul-12 13:50pm

Thanks a lot, it was helpful and indeed i will apply logic to test 100-3 condition.