powershell string contain only number

Question

I have an array with folder names. I want to loop thru this array and find out if an entry is only 7 in length and only contain numbers.

Can anyone please push me in the correct direction? Thanks!

$array -match '^\d{7}$'

user4003407
– user4003407

2015-04-30 07:07:25 +00:00
Commented Apr 30, 2015 at 7:07 — user4003407
– user4003407, Commented Apr 30, 2015 at 7:07

Eduard Uta · Accepted Answer · 2015-04-30 07:38:04Z

2

One solution is while looping through the array names check if the two conditions are met like so:

foreach ($name in "test", "1234567", "test02", "001") {
    if ($name.Length -eq 7 -and $name -match '^\d+$'){
        Write-Host $name
    }
}

answered Apr 30, 2015 at 7:38

Eduard Uta

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2 Comments

verfluecht Over a year ago

I just came across this answer and it helped me. But I don't quite understand what '^\d+$' means. Why does this work?

Eduard Uta Over a year ago

@gwynbleidd that is the regular expression that covers the OP requirement for "capturing" numbers only. We have the two position anchors: leading (^) and trailing ($) and between one or more (+) decimals (\d). Hope this helps!

liorlis · Accepted Answer · 2015-04-30 07:40:10Z

2

As far as i understood your question :

function Is-Numeric ($Value)
{
    return $Value -match "^[\d\.]+$"
}

$birds = "owl","crow","robin","wren","jay","123"
foreach ($bird in $birds) { if($bird.length -eq 3 -and (Is-Numeric $bird)) {"$bird"} }

just switch it to your case :)

answered Apr 30, 2015 at 7:40

liorlis

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