powershell check end of string

#Program to check if string 1234 comes at the end of the string
$str="checking1234"
if ( $str.endswith("1234") )
{
echo "String $str ends with 1234"
}
#Program to check if string "ing" exists in the string
$str="checking1234"
if ( $str.contains("ing") )
{
echo "String $str contains - [ing]"
}
#Program to check if string "check" comes at the begining of the string
 $str="checking1234"
 if ( $str.startswith("check") )
 {
 echo "String $str starts with check"
 }