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A little explanation:

I have a string like (from a commandline programm execution kpsewhich -all etex.src):

c:/texlive/2019/texmf-dist/tex/luatex/hyph-utf8/etex.srcc:/texlive/2019/texmf-dist/tex/plain/etex/etex.src

This string consists of 2 or more concatenated file paths, which are to be separated again.

Dynamic search pattern: c:/

The files are always on the same volume, here c, but the volume name has to be determined.

Is it possible to do something like this with an RegExp?

I could split the string according to the actual filename etex.src, but is the other approach possible?

Update:

The RegExp as follows 

(.+?:[\/\\]+)(?:(?!\1).)*

meets my requirements even better. How to disassemble a string with CaptureGroup?

CarpeDiemKopi
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2 Answers2

1

I'm guessing that maybe this expression would be somewhat close to what you might want to design: 

c:\/.*?(?=c:\/|$)

DEMO

Emma
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    Thank you Emma Peel! To search over multiple lines I had to change the dot against [^] e.g. `c:\/[^]*?(?=c:\/|$)`. Integrated in node.js with `var paths = filename.match(/c:\/[^]*?(?=c:\/|$)/g)`. – CarpeDiemKopi Jul 25 '19 at 16:06
1

I'm not entirely sure what you want this RegExp to retrieve but if you want to get the array of file paths then you can do it with /(?<!^)[^:]+/g regex:

// in node.js
const str = 'c:/texlive/2019/texmf-dist/tex/luatex/hyph-utf8/etex.srcc:/texlive/2019/texmf-dist/tex/plain/etex/etex.src'
const paths = str.match(/(?<!^)[^:]+/g)
// [
//   "/texlive/2019/texmf-dist/tex/luatex/hyph-utf8/etex.srcc",
//   "/texlive/2019/texmf-dist/tex/plain/etex/etex.src"
// ]

This RegExp searches for a sequence of symbols which don't include : and which don't start at the beginning of the string (this excludes c volume or any other volume name)

GProst
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