Regex for extracting filename from path

Question

I need to extract just the filename (no file extension) from the following path....

\\\\my-local-server\\path\\to\\this_file may_contain-any&character.pdf<

Answer 1

also one more for file in dir and root

   ^(.*\\)?(.*)(\..*)$

for file in dir

Full match  0-17    `\path\to\file.ext`
Group 1.    0-9 `\path\to\`
Group 2.    9-13    `file`
Group 3.    13-17   `.ext`

for file in root

Full match  0-8 `file.ext`
Group 2.    0-4 `file`
Group 3.    4-8 `.ext`

Answer 2

TEST ^(.*[\\\/])?(.*?)(\.[^.]*?|)$

example:

/^(.*[\\\/])?(.*?)(\.[^.]*?|)$/.exec("C:\\folder1\\folder2\\foo.ext1.ext")

result:

0: "C:\folder1\folder2\foo.ext1.ext"
1: "C:\folder1\folder2\"
2: "foo.ext1"
3: ".ext"

the $1 capture group is the folder
the $2 capture group is the name without extension
the $3 capture group is the extension (only the last)

works for:

• C:\folder1\folder2\foo.ext
• C:\folder1\folder2\foo.ext1.ext
• C:\folder1\folder2\name-without extension
• only name
• name.ext
• C:\folder1\folder2\foo.ext
• /folder1/folder2/foo.ext
• C:\folder1\folder2\foo
• C:\folder1\folder2\
• C:\special&chars\folder2\f [oo].ext1.e-x-t

Answer 3

For most of the cases ( that is some win , unx path , separator , bare file name , dot , file extension ) the following one is enough:

 // grap the dir part (1), the dir sep(2) , the bare file name (3) 
 path.replaceAll("""^(.*)[\\|\/](.*)([.]{1}.*)""","$3")

Answer 4

This is just a slight variation on @hmd's so you don't have to truncate the .

[ \w-]+?(?=\.)

Demo

Really, thanks goes to @hmd. I've only slightly improved on it.

Answer 5

Try this:

[^\\]+(?=\.pdf$)

It matches everything except back-slash followed by .pdf at the end of the string.

You can also (and maybe it's even better) take the part you want into the capturing group like that:

([^\\]+)\.pdf$

But how you refer to this group (the part in parenthesis) depends on the language or regexp flavor you're using. In most cases it'll be smth like $1, or \1, or the library will provide some method for getting capturing group by its number after regexp match.