Level 3  Go to the Training: Regex challenge

I'm sorry for posting so much, but I just can't seem to understand why my answer is being rejected in level 3.

This is the assignment:
Your pattern shall match all images with the name wechall.ext or wechall4.ext and a valid image extension.
Valid image extensions are .jpg, .gif, .tiff, .bmp and .png.

And I get this error:
Your pattern would match "wechall.jpg ", but it should not match it.

But from the explanation it seems to me that it should match it. Could someone explain this to me?

The challenge also checks against "wechall.jpg "
Note the whitespace at the end of this checked filename.

Cheers
gizmore

Thanks

Hi,

i'm getting reject with "Your pattern would match "wechall3.png", but it should not match it."
But my regex only allows no numbers or a 4.. i have no idea how the check can come up with a 3 allowed?! Every RegEx tests like RegEx Coach / other online Tests said it will not recognize wechall3.png..

I don't want to to post the almost complete RegEx here and i cannot sent PMs yet. But basically what i do is check for "wechall" followed by number and the "possible" operator, followed by . extension..

Does anyone knows whats going on?

It shall only match wechall4 and wechall, but not wechall3 ... maybe that`s the problem?
Another thing might be that . means any char, so you maybe want to escape it like \.

Maybe it helps
gizmore

It only checks vs the explicit 4. Not any number. Also i tried . oder \. - its no difference

Hello challengers.
code(bmp|png|jpg|tiff|gif)
will show:

Quote from Unknown

Your pattern would capture a string, but this is not wanted. Please use a non capturing group.

How can i pass that without () grouping?

Can you give me a link or hint for?
greets grmf.

use a non capturing group (?:group|here)

Quote from Unknown

Correct, let`s see if you can come up with a pattern for the next problem.

Thank you! i have searched since hours but not seen that hint.

Here you have the definition (and difference between others) of non capturing group.
http://www.regular-expressions.info/refadv.html
Regards.