//4.以某一特定位置来截取字符串
var string = " https://www.baidu.com"
let range = string.range(of: "baidu")
let lowerStr = string.substring(to: (range?.lowerBound)!)
//结果为： https://www.
print("to lower string: \(lowerStr)")
let upperStr = string.substring(to: (range?.upperBound)!)
//结果为： https://www.baidu
print("to upper string: \(upperStr)")
let lowerStr2 = string.substring(from: (range?.lowerBound)!)
//结果为： baidu.com
print("from lower string: \(lowerStr2)")
let upperStr2 = string.substring(from: (range?.upperBound)!)
//结果为： .com
print("from upper string: \(upperStr2)")
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