[EMJAAY]

How would one do this? Cheers.

Note: Limited knowledge on vb.net

Any help is appreciated, Cheers!

[Tkings9876]

Does your string only consist of a single character or are you picking out a specific character within a string and wanting to see if it's a number?

[EMJAAY]

Does your string only consist of a single character or are you picking out a specific character within a string and wanting to see if it's a number?

Im trying to pick out a number within a long string eg:

test1test = HasNum

testtest = NoNum

[Tkings9876]

Im trying to pick out a number within a long string eg:

test1test = HasNum

testtest = NoNum

Code

Dim hasNumber As Boolean = False
        Dim input As String = "test1test"

        Dim characters() As Char = input

        For Each c As Char In characters

            If IsNumeric(c) Then
                hasNumber = True
                Exit For
            End If
        Next

        MessageBox.Show(hasNumber.ToString())

This will loop through each character of the string "input". If it finds a numeric character the hasNumber boolen will be set to true and the loop will exit. If no numeric characters have been found hasNumber will be false. Messagebox.Show to display the outcome.

Hope this helps.

[EMJAAY]

Code

Dim hasNumber As Boolean = False
        Dim input As String = "test1test"

        Dim characters() As Char = input

        For Each c As Char In characters

            If IsNumeric(c) Then
                hasNumber = True
                Exit For
            End If
        Next

        MessageBox.Show(hasNumber.ToString())

This will loop through each character of the string "input". If it finds a numeric character the hasNumber boolen will be set to true and the loop will exit. If no numeric characters have been found hasNumber will be false. Messagebox.Show to display the outcome.

Hope this helps.

Testing it now. Thanks!

[Aristocles]

A good approach would be possibly using a Regex too, even though give method above is working.

Code

Dim emjd7 = "emjd7"
If Regex.IsMatch(emjd7, "(\d+)") Then
    Console.WriteLine("yes")
Else
    Console.WriteLine("No")
End If

Here I have a string, emjd7, which contains a number, 7.
Regex (\d+) stand for AnyDigit in the given string.

Here is full source code to test it out :

https://dotnetfiddle.net/OSpmyl

I built my regex using this website : https://txt2re.com/index-vb.php3?s=ggfgdfg5&4

you enter a string an you can click on anything to produce regex, really fast-productive ! :)

For a better approach than mine on Regex, see https://www.dotnetperls.com/regex-vbnet

[darkdoctor]

Testing it now. Thanks!

Very good Baqa ...

[Ninja]

A good approach would be possibly using a Regex too, even though give method above is working.

Code

Dim emjd7 = "emjd7"
If Regex.IsMatch(emjd7, "(\d+)") Then
    Console.WriteLine("yes")
Else
    Console.WriteLine("No")
End If

Here I have a string, emjd7, which contains a number, 7.
Regex (\d+) stand for AnyDigit in the given string.

Here is full source code to test it out :

https://dotnetfiddle.net/OSpmyl

I built my regex using this website : https://txt2re.com/index-vb.php3?s=ggfgdfg5&4

you enter a string an you can click on anything to produce regex, really fast-productive ! :)

For a better approach than mine on Regex, see https://www.dotnetperls.com/regex-vbnet

Regex is a bit overkill.

The Any method from the LINQ namespace like Orka suggested is the way to go.

[Aristocles]

Regex is a bit overkill.

The Any method from the LINQ namespace like Orka suggested is the way to go.

What do you mean by 'overkill' ? Also LINQ syntax may not be noob-friendly enough hence why I shared regex solution

[Ninja]

What do you mean by 'overkill' ? Also LINQ syntax may not be noob-friendly enough hence why I shared regex solution

Regex is a bit too heavy for just checking if a string contains a digit.

[Aristocles]

Regex is a bit too heavy for just checking if a string contains a digit.

I still don't understand, "overkill", now "too heavy" ❓

Google "check if string contains digit c#" will underlines two possibilities : LINQ and Regex. Both are good, I don't think Regex uses that much memory compared to LinQ though I may be wrong.

[+Haze]

Regex is a bit too heavy for just checking if a string contains a digit.

Regex isn't overkill, it's literally designed for tasks like these. Regex is mainly for pattern matching. If anything, Linq is overkill due to the overheads.

[Washi]

Regex isn't overkill, it's literally designed for tasks like these. Regex is mainly for pattern matching. If anything, Linq is overkill due to the overheads.

I very much doubt that since regular expressions are converted to entire method bodies that need to be assembled, whereas LinQ is just a simple lazy iterator.

[+Haze]

I very much doubt that since regular expressions are converted to entire method bodies that need to be assembled, whereas LinQ is just a simple lazy iterator.

Eh, sounds about right, I forgot regex are complex little things behind the scenes.

[HFDone]

the simple way Char.IsNumber