Collection of Regular expression to validate various file formats :-
1.Regular expression to validate file formats for .mp3 or .MP3
Ex:
string str= /^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))+(.mp3|.MP3|.mpeg|.MPEG|.m3u|.M3U)$/;
2.Regular expression to validate file formats for .doc or .docx
Ex:
string str= /^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))+(.doc|.docx|.DOC|.DOCX)$/;
3.Regular expression to validate file formats for .txt or .TXT
Ex:
string str= /^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))+(.txt|.TXT)$/;
4.Regular expression to validate file formats for .jpeg or .JPEG or .gif or .GIF or .png or .PNG
Ex.
String str= /^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))+(.jpeg|.JPEG|.gif|.GIF| .png|.PNG)$/;
5.By above all reg exp u can make your custom reg exp.
Ex:
String str= /^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))+(.jpeg|.JPEG|.gif|.GIF| .png|.PNG)$/;
in place of .jpeg or .gif you can paste your custom file ext. like .zip or .rar etc.
now:- String str= /^(([a-zA-Z]:)|(\\{2}\w+)\$?)(\\(\w[\w].*))+(.”your_file_ext”)$/;
