i wanna check if the following letters in the following words exists. My code is:
$testString="Word"
$illegalCharacter =@{Warning="a","b";Error="c","d"}
if($testString -match $illegalCharacter.Error){
Write-Host "WORKS!"
}
I guess "-contains" only works with Arrays - not Hash Maps. But why do this dont work?
Thanks :)
You have to use a little bit different approach:
$testString="Word"
$illegalCharacter =@{Warning=@("a","b");Error= @("c","d")}
$illegalCharacter.Error | ForEach-Object {
if( $testString.Contains( $_ ) ) {
Write-Host "WORKS!"; break
}
}
EDIT: I wrongly used -contains here first, but -match is what we want.
Another approach:
$testString = "Word"
$illegalCharacter = @{
Warning = "a", "b"
Error = "c", "d"
}
if ($testString -match ($illegalCharacter.Error -join "|")) {
Write-Host "WORKS!"
}
This build a string (example for Error: "c|d") that is parsed as a regex meaning either character c or d
| is one of the illegal characters?
-contains is not a regex operator. $teststring -contains $illegalCharacter.Error -join "|" alone returns False. This has to be a bug or some hidden PowerShell voodoo.
-match at first and was a bit surprised to realize it also worked with -containsYou would have to split up the string first to validate each character. You can do that with .ToCharArray()
My suggestion:
# Will throw for the first illegal character in the word
$testString.ToCharArray() | where { $illegalCharacter.Error -eq $_ } | foreach {
throw "Illegal character: $_"
}
If this is a case-sensitive search, then Split(char[]) will be a concise solution.
$testString="Word"
$illegalCharacter =@{Warning=@("a","b");Error= @("c","d")}
if ($teststring.Split($illegalCharacter.Error).Count -gt 1) {
Write-Host "WORKS!"
}
If you want to use the -match operator or -cmatch (case-sensitive match) operator, you will need to create a regex expression that includes alternations (|).
$testString="Word"
$illegalCharacter =@{Warning=@("a","b");Error= @("c","d")}
$regex = ($illegalcharacter.Error |% { [regex]::Escape($_) }) -join '|'
if ($teststring -match $regex) {
Write-Host "WORKS!"
}
The regex | character performs an OR. In this case, it will attempt to match c and alternatively d if c does not match. Special regex characters need to be escaped if you to match them literally. Regex.Escape(String) escapes regex characters automatically.
