関連ワード:  powershell first character of string    powershell get first character of string    powershell check first character of string    powershell select first character of string    powershell remove first character of string    powershell compare first character of string    powershell test first character of string    powershell grab first character of string    powershell first 3 characters of string    powershell first 4 characters of string