Javascript regular expression to grab filename from URI

[Ampa]

I am very new to regular expressions and am struggling with something that I am sure is really pretty straight forward.

I have a string from which I need to return the just the filename, without the extension, or the path, or the serial number (xx = two digits at the start of the filename)

Code: Text [Select]

1. http://website/subdir/xx title of the image.jpg
2. http://aboutfaceuk.com/gallery/01%20a%20very%20big%20dog.jpg

The top example illustrates the general form of the input text, and the bottom is a real example from the site. The results should be...

Code: Text [Select]

1. title of the image
2. a very big dog

Other factors...

In theory there may or may not be a subdir.
The %20 should be replaced with spaces (not entirely sure why they are %20s in the first place, but they are!)
The regex flavour is Javascript.

Help appreciated!

Thanks Ampa

[Ampa]

Here is how I am doing it without using a regex...

Code: Javascript [Select]

1. var splitArray = this.preLoader.src.replace(/\%20/g, ' ').split('/');
2. var IMGTitle = splitArray[splitArray.length-1];
3. IMGTitle = IMGTitle.substring(3, IMGTitle.length-4);

A bit long winded perhaps?
1) Replace the %20s with spaces.
2) Split the string at the /s and select the last one.
3) Grab the middle of the string.

Would regex be better?

[mhb]

Hi Ampa,

I am not sure if this really helps, since it can't replace the %20.
Nevertheless it replaces the given string with the filename.

Code: Javascript [Select]

1. ^.*/\d{2}\s(.*)\..*$
2. $1

In JavaScript this could be done like this:

Code: Javascript [Select]

1. result = subject.replace(/^.*\/\d{2}\s(.*)\..*$/g, "$1");

I think the best solution for the %20 is to replace these using the JavaScript replace command or using a second regular expression.

Hope it helps...

Marc

[Ampa]

Thanks Marc, I shall try these out 

[mwb1100]

The %20 should be replaced with spaces (not entirely sure why they are %20s in the first place, but they are!)

-Ampa (April 02, 2008, 12:43 PM)

Strictly speaking, a URL that's passed to a web server should not have spaces in it (but most browsers and web servers deal with them fine anyway).  You can use javascript's decodeURI() function to convert the %20's (or other encoded characters that might be in the string) to their unencoded form.

[Ampa]

mwb1100: thanks for the tip about decodeURI().

I realise that the %20s are usually there for a good reason, but the filename that I extract is not being passed to the browser, it needs to be read by the user, so in this instance spaces are friendlier