Check string for all lowercase letters in powershell

Question

I want to check if a powershell string is lowercase.

I am not the best regex monkey in the world, but I tried these lines:

if( $mystring -match "[a-z]^[A-Z]" ) {
echo "its lower!"
}

But, of course, they do not work, and the search in interwebs did not force me anywhere. Does anyone know a way to do this (besides testing each character in a loop)?

Answer 1

PowerShell does not case-sensitive by default, so you need to use the operator -cmatch:

if ($mystring -cmatch "^[a-z]*$") { ... }

-cmatchalways case sensitive, and -imatchalways case insensitive.

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• A ([a-z])
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PS: , , , , , , , , , , :

if ($mystring -cmatch "^[^A-Z]*$") { ... }

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Answer 2

, , , :

$mystring -ceq $mystring.ToLower()

Answer 3

, , : "^[^A-Z]*$"

false , , . , "hello world 123" .

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