regex - Most efficient way to look for files in a directory tree that match a regular expression -


i writing little app enable users specify regular expression specify files copy location. expression might this:

\w\:\/rootfolderone\/subfoldertwo/\w+/filename\d+.mpg

so question how efficiently find files on drive match pattern?

i have load contents of each folder 1 one. traverse directory tree , load every folder in whole file system , compare each file's entire path regular expression. wasteful loading contents of rootfoldertwo or subfolderthree not provide valid results.

at root level how know load rootfolderone not rootfoldertwo?

most efficient way? don't know in air. maybe ane you'd better result. pure air though, can think of:

(it slow, using worker thread highly advised)

    private var expression:regexp;  //to store regex search     private var matchedfiles:vector.<file>; //store matched files      public function main()      {         expression = /\btest(er | ing | ed | s)?\b/; //anything word test/tester/testing/tests in          matchedfiles = new vector.<file>();         //scanfolder(new file("file:///c://")); //windows c drive,  replace whatever approprite camera card path.         scanfolder(file.documentsdirectory); //for testing purposes i'm going scan documents directory          trace(matchedfiles.length + " files found");     }      private function scanfolder(file:file):void {         if (!file.exists) return; //if directory doesn't exist, exit function          var files:array = file.getdirectorylisting(); //list of files in directory         var f:file;         (var i:int = 0; < files.length; i++ ) { //loop thorugh files             f = files[i];             if (f.isdirectory) {                 scanfolder(f); //if directory, scan             }else{                 //if matches regex, put matched array                 if (expression.test(f.name)) matchedfiles.push(f);             }         }     }

Comments

Post a Comment

Popular posts from this blog

java - Spring Data JPA: Why findOne(id) executing delete query internally? -

i have 1 application using @manytomany annotation link 2 different entities 1 parent entity. not sure if have implemented properly. when execute .findone() on parent entity's repository find it, @ first fetch data along executing delete queries internally delete record mapping table (a table jpa creates after adding @manytomany annotation.). following generated sql queries , code snippet: java class @entity @table(name = "inventory") public class inventory { @id long id; // many other properties @manytomany(fetch=fetchtype.lazy) private list<stream> streams; @manytomany(fetch=fetchtype.lazy) private list<subject> subjects; } there no other annotation i've put in stream , subject entity class link inventory class. when run app, create following tables: inventory stream subject inventory_stream inventory_subject (inventory_stream , inventory_subject, 2 tables created automatically, don't k...
Read more

python - Mongodb How to add addtional information when aggregating? -

i beginner , wrote line pipeline works, wanna add other information output, screen name , or number of tweets.i tried add under $group gave me syntax error everytime here pipeline: def make_pipeline(): # complete aggregation pipeline pipeline = [ { '$match': { "user.statuses_count": {"$gt":99 }, "user.time_zone": "brasilia" } }, { "$group": { "_id": "$user.id", "followers": { "$max": "$user.followers_count" } } }, { "$sort": { "followers": -1 } }, { "$limit" : 1 } ]; i using on example : { "_id" : objectid("5304e2e3cc9e684aa98bef97"), "text" : "first week of school on :p", "in_reply_to_status_id" : null, "retweet_count" : null, ...
Read more

java - Incorrect order of records in M-M relationship in hibernate -

Image
i have 4 records in bridge table in mysql database. using @manytomany in hibernate, accurate order of employees incorrect incorrect of projects. following required material figure out doing mistake. this source. @entity @table(name="project") public class projectbean { @id @generatedvalue @column(name="project_id") private int projectid; @column(name="title") private string projecttitle; @manytomany(mappedby="projects") private collection<employeebean> employees; public projectbean() { employees = new arraylist<employeebean>(); } //getters & setters } @entity @table(name="employee") public class employeebean { @id @generatedvalue @column(name="employee_id") private int employee_id; @column(name="first_name") private string ...
Read more