hi, i trying to upload images to folder. here i need to upload only images like .JPEG|.jpeg|GIF|.gif|.PNG|.png|bmp|.BMP
what is expression that we should write here so that when ever user tryis to upload thier files rather than this
any solution would be great thank you
Generally that's a bad idea, but...
/(jpg|gif|bmp|png)$/
Run the expression with whatever language you're using and make sure you make it case insensitive.
I say it's a bad idea, because you're better off checking the actual data in the file after the upload occurs. I can rename a file to anything I want and upload it to your site.
ETA: the forward slashes may be optional in your language.
I think it should work with:
\w*.(jpg|jpeg|gif|png|bmp)$ Using this, you need to use IgnoreCase in asp.net.
\w are all alphanumeric characters followed by a dot (escaped because it is a special character). Then one of your extensions.
But remember: Files are not identified by their extension, but by their content. You might be able to use something alike to linux "file" utility for identifying the type of file. I don't know if something similar exists for asp.net
you can try this..
(.*\.([Gg][Ii][Ff])|.*\.([Jj][Pp][Gg])|.*\.([Bb][Mm][Pp])|.*\.([pP][nN][gG])|.*\.([tT][iI][iI][fF])$)