正则表达式匹配两个“标识点”之间的内容

示例说明

如何用正则取出所有的id值

{
	"state": 0,
	"data": [{
				"{
	"state": 0,
	"data": [{
				"id": "228937",
				"msg": "{\"fromAccountNick\":\"游客CBD57****D8E75\",\"elems\":[{\"type\":\"TIMTextElem\",\"content\":{\"text\":\"love_msg\"}}],\"time\":1552976802,\"fromaccount\":\"游客CBD57****D8E75\"}",
				"fromaccount": "游客CBD57****D8E75",
				"dottime": "0:00",
				"parent_id": "",
				"time": "1552976882"
			}, {
				"id": "228920",
				"msg": "{\"fromAccountNick\":\"游客CBD57****D8E75\",\"elems\":[{\"type\":\"TIMTextElem\",\"content\":{\"text\":\"love_msg\"}}],\"time\":1552976423,\"fromaccount\":\"游客CBD57****D8E75\"}",
				"fromaccount": "游客CBD57****D8E75",
				"dottime": "0:00",
				"parent_id": "",
				"time": "1552976521"
			}, {
				"id": "228919",
				"msg": "{\"fromAccountNick\":\"游客CBD57****D8E75\",\"elems\":[{\"type\":\"TIMTextElem\",\"content\":{\"text\":\"love_msg\"}}],\"time\":1552976393,\"fromaccount\":\"游客CBD57****D8E75\"}",
				"fromaccount": "游客CBD57****D8E75",
				"dottime": "0:00",
				"parent_id": "",
				"time": "1552976521"
			}, {
				"id": "228915",
				"msg": "{\"fromAccountNick\":\"游客CBD57****D8E75\",\"elems\":[{\"type\":\"TIMTextElem\",\"content\":{\"text\":\"love_msg\"}}],\"time\":1552976066,\"fromaccount\":\"游客CBD57****D8E75\"}",
				"fromaccount": "游客CBD57****D8E75",
				"dottime": "0:00",
				"parent_id": "",
				"time": "1552976101"
			}, {
				"id": "228914",
				"msg": "{\"fromAccountNick\":\"游客CBD57****D8E75\",\"elems\":[{\"type\":\"TIMTextElem\",\"content\":{\"text\":\"love_msg\"}}],\"time\":1552976066,\"fromaccount\":\"游客CBD57****D8E75\"}",
				"fromaccount": "游客CBD57****D8E75",
				"dottime": "0:00",
				"parent_id": "",
				"time": "1552976101"
			}, {
				"id": "228593",
				"msg": "{\"fromAccountNick\":\"游客CBD57****D8E75\",\"elems\":[{\"type\":\"TIMTextElem\",\"content\":{\"text\":\"love_msg\"}}],\"time\":1552890552,\"fromaccount\":\"游客CBD57****D8E75\"}",
				"fromaccount": "游客CBD57****D8E75",
				"dottime": "0:00",
				"parent_id": "",
				"time": "1552890661"
			}, {
				"id": "228592",
				"msg": "{\"fromAccountNick\":\"游客CBD57****D8E75\",\"elems\":[{\"type\":\"TIMTextElem\",\"content\":{\"text\":\"love_msg\"}}],\"time\":1552890444,\"fromaccount\":\"游客CBD57****D8E75\"}",
				"fromaccount": "游客CBD57****D8E75",
				"dottime": "0:00",
				"parent_id": "",
				"time": "1552890481"
			}, {
				"id": "228591",
				"msg": "{\"fromAccountNick\228937",
				"msg": "{\"fromAccountNick\":\"游客CBD57****D8E75\",\"elems\":[{\"type\":\"TIMTextElem\",\"content\":{\"text\":\"love_msg\"}}],\"time\":1552976802,\"fromaccount\":\"游客CBD57****D8E75\"}",
				"fromaccount": "游客CBD57****D8E75",
				"dottime": "0:00",
				"parent_id": "",
				"time": "1552976882"
			}, {
				"id": "228920",
				"msg": "{\"fromAccountNick\":\"游客CBD57****D8E75\",\"elems\":[{\"type\":\"TIMTextElem\",\"content\":{\"text\":\"love_msg\"}}],\"time\":1552976423,\"fromaccount\":\"游客CBD57****D8E75\"}",
				"fromaccount": "游客CBD57****D8E75",
				"dottime": "0:00",
				"parent_id": "",
				"time": "1552976521"
			}, {
				"id": "228919",
				"msg": "{\"fromAccountNick\":\"游客CBD57****D8E75\",\"elems\":[{\"type\":\"TIMTextElem\",\"content\":{\"text\":\"love_msg\"}}],\"time\":1552976393,\"fromaccount\":\"游客CBD57****D8E75\"}",
				"fromaccount": "游客CBD57****D8E75",
				"dottime": "0:00",
				"parent_id": "",
				"time": "1552976521"
			}, {
				"id": "228915",
				"msg": "{\"fromAccountNick\":\"游客CBD57****D8E75\",\"elems\":[{\"type\":\"TIMTextElem\",\"content\":{\"text\":\"love_msg\"}}],\"time\":1552976066,\"fromaccount\":\"游客CBD57****D8E75\"}",
				"fromaccount": "游客CBD57****D8E75",
				"dottime": "0:00",
				"parent_id": "",
				"time": "1552976101"
			}, {
				"id": "228914",
				"msg": "{\"fromAccountNick\":\"游客CBD57****D8E75\",\"elems\":[{\"type\":\"TIMTextElem\",\"content\":{\"text\":\"love_msg\"}}],\"time\":1552976066,\"fromaccount\":\"游客CBD57****D8E75\"}",
				"fromaccount": "游客CBD57****D8E75",
				"dottime": "0:00",
				"parent_id": "",
				"time": "1552976101"
			}, {
				"id": "228593",
				"msg": "{\"fromAccountNick\":\"游客CBD57****D8E75\",\"elems\":[{\"type\":\"TIMTextElem\",\"content\":{\"text\":\"love_msg\"}}],\"time\":1552890552,\"fromaccount\":\"游客CBD57****D8E75\"}",
				"fromaccount": "游客CBD57****D8E75",
				"dottime": "0:00",
				"parent_id": "",
				"time": "1552890661"
			}, {
				"id": "228592",
				"msg": "{\"fromAccountNick\":\"游客CBD57****D8E75\",\"elems\":[{\"type\":\"TIMTextElem\",\"content\":{\"text\":\"love_msg\"}}],\"time\":1552890444,\"fromaccount\":\"游客CBD57****D8E75\"}",
				"fromaccount": "游客CBD57****D8E75",
				"dottime": "0:00",
				"parent_id": "",
				"time": "1552890481"
			}, {
				"id": "228591",
				"msg": "{\"fromAccountNick\

取出所有id值

其实就是取出 “id”:" 与 ","msg之间的内容
正则：(?<=("id":")).*?(?=","msg)

取出所有id值包括前面的标识

正则：(?=("id":")).*?(?=","msg)

取出所有id值包括前面的标识和后面的标识

正则：(?=("id":")).*?(?<=","msg)

知识点

1. (?<=标识A) 匹配一个位置,而不是字符.这个位置在 标识A 后面

2. (?=标识B) 匹配一个位置,而不是字符.这个位置在 标识B 前面

3. .* 这两个位置之间的所有字符.贪婪匹配模式

4. .*? 这两个位置之间的所有字符.懒惰匹配模式，也叫非贪婪模式