如何快速使用正则表达式? [英] how to use regular expressions in swift?

问题描述

我正在尝试快速编写JSON解析器.我正在编写用于解析JSON代码不同部分的函数.我编写了一个字符串解析器，该字符串解析器通过检查\开头来检测JSON数据中的一个字符串，如果我遇到另一个\"，则将其分离并作为字符串返回，但是当我遇到以下JSON文本时:

I am trying to write a JSON parser in swift. I am writing functions for parsing different parts of JSON code. I wrote a string parser which detects a string from the JSON data, by checking the start with \" and if I meet with another \" it is separated and returned as a String but when I met with this JSON text:

{"gd$etag": "W\/\"D0QCQX4zfCp7I2A9XRZQFkw.\""}

在上面的情况下，我编写的函数失败了，因为在值部分中，它必须将整体识别为String，而我的函数仅是收集

the function I wrote failed in the above case since in the value part it has to recognise the whole as String while mine is working to collect only

W\/

因为我给出了以\开头和结尾的条件， 当我在线搜索时，我了解到这与正则表达式有关.所以帮我解决这个问题！

Since I gave the condition as starting and ending with \" when I searched online I understood it is something in relation to regular expressions. So help me out to solve this!

推荐答案

if first(jsonString) == "\"" {
        jsonString.removeAtIndex(jsonString.startIndex)
        for elem in jsonString {
            if elem == "\\" {
                s = 1
                parsedString.append(elem)
                jsonString.removeAtIndex(jsonString.startIndex)
                continue
            }
            if s == 1 && elem == "\""{
                parsedString.append(elem)
                jsonString.removeAtIndex(jsonString.startIndex)
                s = 0
                continue
            }
            else if elem == "\""{
                jsonString.removeAtIndex(jsonString.startIndex)
                break
            }
            parsedString.append(elem)
            jsonString.removeAtIndex(jsonString.startIndex)
            s = 0
        }

此代码可让我解决我的问题，以使其保持快速状态.

This code lets me solve my issue to keep it pure swift.

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