How to check variable if chars are inside

Hi fellow sufferers :)
How can I accomplish to check if a variable a$ contains only chars like (A,B,C,D,E, ....) ... I need to make sure that my variable only contains numbers ....
Thanks in advance for your help/ideas!
Markus

function Is-Numeric ($Value) {
return $Value -match "^[\d\.]+$"
Is-Numeric 1.23
True
Is-Numeric 123
True
Is-Numeric ""
False
Is-Numeric "asdf123"
False
Source from http://stackoverflow.com/

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How to check variable if chars are inside

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