Question

I need a regex that can parse the following example file paths and return the path, base, ext and num as shown in the following table.

This regex almost works, but unfortunately it falls short when the filename contains multiple periods.

^(.*\\)?(.*?)\.(.*?)\.?([0-9]+)?$

input                         path            base            ext     num
---------------------------   ------------    ----------      ------  ------
c:\temp\00883005.prt.1        c:\temp\        00883005        prt     1
00883005.prt                                  00883005        prt
00883005.prt.1                                00883005        prt     1
\\data\test\00883005.prt      \\data\test\    00883005        prt
\\data\test\00883005.prt.1    \\data\test\    00883005        prt     1
00883005.test.prt                             00883005.test   prt        
00883005.test.prt.1                           00883005.test   prt     1
c:\temp\00883005.test.prt.1   c:\temp\        00883005.test   prt     1
00883005.mp3                                  00883005        mp3      

Here is the working AutoHotkey code (thanks to the folks below):

RegExMatch( filename, "^(.*\\)?(.*?)\.([^\.]*?)\.?(\b[0-9]+)?$", data)
outputdebug % "dir = " data1
outputdebug % "base = " data2
outputdebug % "ext = " data3
outputdebug % "num = " data4

Answer 1

Try this version:

^(.*\\)?(.*?)\.([^\.]*?)\.?([0-9]+)?$

The difference is the second-to-last group: Changed ([^\.]*?) to (.*?) such that dot is not included in the match.

Tested on the great http://www.regexplanet.com against the provided data.