Check if string contains numeric value in PowerShell?

Question

I want to check if a string contains a numeric value. I have this code :

$string = "some string that contains 123456     in the middle"
$substring = $string.substring(27,9).Trim()

I have $substring which will be containing "123456" and I found this IsNumeric function here : In PowerShell, how can I test if a variable holds a numeric value?

The thing is that this when I'm extracting it from $string it acts like string type and IsNumeric returns false since it's comparing it to the all numeric types. and even tough it will contain a number the output of IsNumeric will be false.

Is there a better way to check if string contains numeric values?

Answer 1

The correct way to check if a given string can be turned into a number:

[string]$InString = "123456"
[Int32]$OutNumber = $null

if ([Int32]::TryParse($InString,[ref]$OutNumber)){
    Write-Host "Valid Number"
    $OutNumber
} else {
    Write-Host "Invalid Number"
    #error code here
}

then $OutNumber will contain the number as a numeric type.