powershell slice string
$myString = "helloWorld"
# using the range operator [(start_i)..(end_i)]
$myString[3..8] -join '' # 'loWorl'
$myString[-4..3] -join '' # 'orldhello'
# using .Substring(start_i, substring_length)
$myString.Substring(3, 3) # loWorl
$myString.Substring(1) # elloWorld