How to get the last numeric digits in a string

  • Thread starter Thread starter Appr3nt1c3
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A

Appr3nt1c3

Hello everyone,

How can I get the last numeric digits of a string? The string may
contain non-numeric characters but I only want to obtain the last part
that contains numbers.

Example:

Input: "0001"
Output: "0001"

Input: "001-0001"
Output: "0001"

Input: "001-A001"
Output: "001"

Input: "001-001A"
Output: "" or "0"

Input: "001-0001-1"
Output: "1"

I know than this can be done using by iterating each character in the
string and making if..else conditions for each character, but is there
a one-liner that can do this?

BTW, the output's length is not fixed.

Thanks,

Diego
 
Appr3nt1c3 said:
Hello everyone,

How can I get the last numeric digits of a string? The string may
contain non-numeric characters but I only want to obtain the last part
that contains numbers.
Click to expand...
Input: "001-001A"
Output: "" or "0"
Click to expand...

How does this match to your definition? Should it be "001"?
I know than this can be done using by iterating each character in the
string and making if..else conditions for each character, but is there
a one-liner that can do this?
Click to expand...

This is not just one line, but here is my suggestion:

Dim Input As String = "001-001A"
Dim Parts As String() = Input.Split("-")
Dim Result As String = ""
For i As Integer = Parts.Length - 1 To 0 Step -1
If IsNumeric(Parts(i)) Then
Result = Parts(i)
Exit For
End If
Next

I'm sure that somebody will post a nice LINQ-command to make this with one
line. :-)

-Teemu
 
How does this match to your definition? Should it be "001"?


This is not just one line, but here is my suggestion:

        Dim Input As String = "001-001A"
        Dim Parts As String() = Input.Split("-")
        Dim Result As String = ""
        For i As Integer = Parts.Length - 1 To 0 Step -1
            If IsNumeric(Parts(i)) Then
                Result = Parts(i)
                Exit For
            End If
        Next

I'm sure that somebody will post a nice LINQ-command to make this with one
line. :-)

 -Teemu
Click to expand...

Hi Teemu,

Thank you for your reply.
How does this match to your definition? Should it be "001"?
Click to expand...

Sorry for the confusing post. The output can be "". I can just return
"0" from my calling function if the result is "".

BTW, I'm using VB .Net 2005, so I can't use LINQ.

Been reading up on RegEx but can't seem to get its concept yet.

Thanks,

Diego
 
Sorry for the confusing post. The output can be "". I can just return
"0" from my calling function if the result is "".
Click to expand...

But if you want the last numeric part of this string "001-001A" I don't
understand why the result should be "" or "0" instead of "001"?

Did you try my code does it work or are you looking for more elegant
solution?

-Teemu
 
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