PowerShell tips to determine whether to cover the case _powershell

You can use regular expressions to check whether one character contains one uppercase letter:

$text 1 = ' This is the all lower-case '
$text 2 = ' lower-case ', ' Not all '
 
$text 1-cmatch ' [A-z] '
$text 2-cmatch ' [A-z] '

The result returns "true" or "false"

In turn, check to see if it contains lowercase, and you can try this:

$text 1 = ' This are all lower-case '
$text 2 = ' This is ' lower-case '

$text 1-cmatch ' ^[a-z\s-]*$ '
$text 2-c Match ' ^[a-z\s-]*$ ' 

The result returns "true" or "false"

Overall, this test is more difficult because you need to consider the legality of all characters. In this example, I used a lowercase string from A to Z, a space and a minus sign.

A valid string is embedded in the middle of "^" and "$" (it represents the start and end of a line). The asterisk represents quantifying any preceding legitimate strings.

Supports all PS versions