From: RichardOnRails <RichardDummyMailbox58407@...>
Date: 2008-08-04T02:05:27+09:00
Subject: Look-around not working in ruby 1.9.0 or my mistake?

Hi,

I just installed ruby 1.9.0 (2008-07-25 revision 18217) [i386-mswin32]
in order get Ruby look-behind functionality.  I expected the following
snippet to insert a substring, but it did nothing:

Ruby:
  printf("item = \"%s\"\n", item) if $DEBUG
  printf("item basename = \"%s\"\n", File.basename(item)) if $DEBUG
  item.sub!( /(?<=Investment-\d\d\.\d\d)(?=-)/, '.2008')
  printf("new item  base = \"%s\"\n", File.basename(item)) if $DEBUG

Output:
item = "K:\___Investment\2008-Trades\Investments-06.19-2100.xls"
item basename = "Investments-06.19-2100.xls"
new item  base = "Investments-06.19-2100.xls"

Expected:
new item  base = "Investments-06.19.2008-2100.xls"

Any idea of what's wrong?

TIA,
Richard