Reg
Reg 是 NSRegularExpression 的友好封装
TLDR
把以下这个
let range = NSRange(location: 0, length: string.utf16.count)
let regex = try? NSRegularExpression(pattern: "^gummy bears have no cares")
let str = "gummy bears have no cares"
let firstMatch = regexs?.firstMatch(in: str, options: [], range: range)
let matchRange = Range(firstMatch.range, in: str)
let matchStr = String(str[matchRange])变成这样
let str = "gummy bears have no cares"
let matchStr = "^gummy bears have no cares".firstMatch(in: str)