PowerShell Input Validation - Input should NOT be ALL numbers

Question

I have the following code that works well for validating length...

DO {
    $NewID = Read-Host -Prompt " NEW ID NAME of object (8-15 chars)   "
} UNTIL ($NewID.Length -gt 7 -and $WS_NewName.Length -lt 16)

How can I include code that ensures input contains either an ALPHA or ALPHANUMERIC string, but NOT a purely NUMERIC one?

Robert Dyjas · Accepted Answer · 2018-07-13 07:03:44Z

1

This can be easily doable using regular expressions like that:

($NewID -match '^[A-z0-9]*$') -and ($NewID -notmatch '^[0-9]*$')

Short explanation: first expression looks for alpha/alphanumeric string and the second discards purely numeric entries.

By the way, in your example you use $NewID and then $WS_NewName in Until expression, that might be confusing (however, I assume you just forgot to change it while pasting here)

answered Jul 13, 2018 at 7:03

Robert Dyjas

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1 Comment

Jee Over a year ago

Yes, you're right about the variable, @robdy. I overlooked that, sorry. And thanks for the concise explanation to the answer you provided. Made me understand the use and structure or regex better. =)

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