正则表达式 in iOS.md

正则表达式 in iOS

• 正则表达式用NSRegularExpression表示
  • NSRegularExpression(pattern: "id=\\(d.)", options: .caseInsensitive)
• 匹配的结果用NSTextCheckingResult表示
  • 包括匹配的结果的range信息
  • range(at: index)方法来获取每个group的信息

举例

//String string = http://www.xxx.com?id=10086&media=xxxx
//获取上面网址中的id值
do {
    let regularExp = try NSRegularExpression(pattern: "id=(\\d+)", options: .caseInsensitive)
    let firstResult = regularExp.firstMatch(in: string, options: [], range: NSRange(location: 0, length: string.count))
    if let range = firstResult?.range(at: 1) {
        let meipaiFeedId = (string as NSString).substring(with: range)
    }
} catch {
    printIfDebug(error)
}

参考

• nsregularexpression