Regex 使用PowerShell和正则表达式解析文本

使用PowerShell和正则表达式分析文本：

查找

“display\u name”：“elocin\u anagram”

并输出

elocin\u anagram

。对所有

“显示名称：…”

重复上述步骤

你会怎么做

临时文件夹中不应存在名为

1.txt

的文件

# set-content of text file
sc $env:temp\1.txt '_total":19,"subscriptions":[{"created_at":"2018-06-15T19:34:38Z","_id":"b7c42f6ce857162220e99533d3d6dc1ae11fac8d","sub_plan":"3000","sub_plan_name":"Channel Sub (❤ω❤)♡ ♡ ♡(elocin_anagram)","is_gift":false,"user":{"display_name":"elocin_anagram","type":"user","bio":"Games I like to play are VRChat, Beat Saber, Space Engineers, and Apex. I am also a certified Electronics Technician. You might see me make electronics and 3d model.","created_at":"2015-06-17T05:37:38Z","updated_at":"2020-05-11T05:51:58Z","name":"elocin_anagram","_id":"93742615","logo":"https://static-cdn.jtvnw.net/jtv_user_pictures/d37d128b-59b1-4015-9776-74866feb1d44-profile_image-300x300.png"},"sender":null},{"created_at":"2019-07-10T00:04:45Z","_id":"6a26c5a56b39d142a6e25ad30589a1b923fbc1bb","sub_plan":"1000","sub_plan_name":"Channel Sub(≧◡≦) ♡ (elocin_anagram) ","is_gift":false,"user":{"display_name":"LuckeaterVR","type":"user","bio":"","created_at":"2018-12-08T04:55:48Z","updated_at":"2020-04-24T01:44:56Z","name":"luckeatervr","_id":"00000","logo":"https://static-cdn.jtvnw.net/jtv_user_pictures/322ba52a-655c-42a4-8cc9-7b875debd5dd-profile_image-300x300.png"},"sender":null},{"created_at":"2020-01-16T01:23:17Z","_id":"17704f74767b5592c5fc221eca11a20579a8162c","sub_plan":"3000","sub_plan_name":"Channel Sub (❤ω❤)♡ ♡'
(gc $env:temp\1.txt | select-string '"display_name":"(.*?)"' -AllMatches).Matches.Value | % {$_ -match '"display_name":"(.*?)"' > $null; $matches[1]}
#

结果:

elocin_anagram
LuckeaterVR

---

如果使用具有正向后视功能的正则表达式，则可以大大简化代码：

gc $file |select-string '(?<="display_name":")[^"]+' -AllMatches | Select-Object -Expand Matches | %{ $_.Value }

---

gc$file | select string'（？您好，我不清楚您在问什么。@JPBlanc-代码复查或
（gc$env:temp\1.txt | select string'“display_name”：“（.*？”）-AllMatches.Matches |%{$_-match'“display_name:”（.*？”>$null；$Matches[1]