Dowst.Dev

[double]$pi = 22/7
$pi.ToString('0.00')

Convert number to string. The number of deciaml places can be controled by the value in the ToString()

PS C:\> [double]$pi = 22/7
>> $pi.ToString('0.00')

3.14

[int]$int = 10
$int.ToString()

Convert number to string

PS C:\> [int]$int = 10
>> $int.ToString()

10

$string.ToLower()

String to lowercase

PS C:\> $string = "WILLIAMS"
>> $string.ToLower()

williams

$string.Substring(0,1).ToUpper() + $string.Substring(1,$string.Length-1).ToLower()

String to uppercase on first letter only

PS C:\> $string = "williams"
>> $string.Substring(0,1).ToUpper() + $string.Substring(1,$string.Length-1).ToLower()

Williams

$string.ToUpper()

String to uppercase

PS C:\> $string = "williams"
>> $string.ToUpper()

WILLIAMS

$string = "In mathematics, summation (capital Greek sigma symbol: ∑) is the addition of a sequence of numbers."
$string.ToCharArray() | ForEach-Object{
    $char = $_
    try{$ascii = [byte][char]$char}
    catch{"$char - None ascii character" }
}

Breaks the string into a char array and attempts is convert the char back to it ASCII value.
If it fails to convert then it is not a standard ASCII character.

PS C:\> ∑ - None ascii character

$string = "LastName,  ([samaccountname])"
[Regex]::Matches($string, '(?<=\<)(.*?)(?=\>)').Value

Uses a regex expression with find all characters that match the expression.

PS C:\> $string = "LastName,  ([samaccountname])"
>> [Regex]::Matches($string, '(?<=\<)(.*?)(?=\>)').Value

FirstName

$string = "LastName, FirstName ([samaccountname])"
[Regex]::Matches($string, '(?<=\[)(.*?)(?=])').Value

Uses a regex expression with find all characters that match the expression.

PS C:\> $string = "LastName, FirstName ([samaccountname])"
>> [Regex]::Matches($string, '(?<=\[)(.*?)(?=])').Value

samaccountname

$string = "LastName, FirstName ([samaccountname])"
[Regex]::Matches($string, '(?<=\()(.*?)(?=\))').Value

Uses a regex expression with find all characters that match the expression.

PS C:\> $string = "LastName, FirstName ([samaccountname])"
>> [Regex]::Matches($string, '(?<=\()(.*?)(?=\))').Value

[samaccountname]

$array = 'The','quick','brown','fox','jumps','over','the','lazy','dog.'
$array -join(';')

Uses a join to combine the strings

PS C:\> $array = 'The','quick','brown','fox','jumps','over','the','lazy','dog.'
>> $array -join(';')

The;quick;brown;fox;jumps;over;the;lazy;dog.