Java regex for image filename?

Question

I have to filter filenames to match only image (png,jpg,gif,bmp) files, is possible to make a such regex or do I have to have different regex for every file type? It also cannot contain path like ../../ or /var/app/filename.exe etc.

From where are you getting this file paths? From browser? From FileDialog? — Harry Joy
– Harry Joy, Commented Aug 18, 2011 at 5:43
Request is made like this myserverurl?filename=imagefilename.png — newbie
– newbie, Commented Aug 18, 2011 at 6:24

StealthRT · Accepted Answer · 2019-02-06 22:15:05Z

12

I'll use something like this... This should cover most cases without going too much into crazy details...

(.*/)*.+\.(png|jpg|gif|bmp|jpeg|PNG|JPG|GIF|BMP|JPEG)$

As a Java String this regex looks like this:

"(.*/)*.+\\.(png|jpg|gif|bmp|jpeg|PNG|JPG|GIF|BMP|JPEG)$"

Hope that helps... :)

edited Feb 6, 2019 at 22:15

StealthRT

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answered Aug 18, 2011 at 6:37

fgysin

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Maciej Ziarko · Accepted Answer · 2011-08-18 05:50:04Z

4

Link:

http://www.mkyong.com/regular-expressions/how-to-validate-image-file-extension-with-regular-expression/

I hope you find it useful.

edited Aug 18, 2011 at 5:50

answered Aug 18, 2011 at 5:44

Maciej Ziarko

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2 Comments

newbie Over a year ago

I have to mention that that code must be edited if you don't want to allow paths in filenames. I used ([\w]+(\.(?i)(jpg|png|gif|bmp))$) , which means only letters and numbers are allowed in filename.

alexander Over a year ago

It might be useful to provide any code, with some explanation. Imagine the blog does not exist any more.

user unknown · Accepted Answer · 2011-08-18 06:04:00Z

2

Pretty easy:

re = ".*\\.(png|jpg|gif|bmp)"

as long as you don't need UPPERCASE and jpeg. :)

answered Aug 18, 2011 at 6:04

user unknown

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Comments

nAkhmedov · Accepted Answer · 2014-12-04 12:56:37Z

0

This pattern is working for me: (.*/)*.+\.(png|jpg|gif|bmp|jpeg|PNG|JPG|GIF|BMP)$

answered Dec 4, 2014 at 12:56

nAkhmedov

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