j> All,
j> I need to search for a pattern in a string but instead of starting the
j> search at the beginning of the string I need it to start at the end.
j> So if I had the string "myscriptmycode" and I wanted to search for the
j> pattern "my" I need it to find the second "my" in the string.  How can
j> I do this?  Can this be done through pattern matching or is there a
j> better way?  Any suggestions would be appreciated.  Thanks.

With regexps:

1. Use /.*my/

   .* will eat as much as possible chars this pattern will match last
   'my' string.

2. Intersting technique: reverse string and use reversed pattern
   (/ym/).

Using rindex:

1. rindex $str, 'my';

What should you use? It depends on what are you going to do with this
string.

# allow a leading ".*" to gobble up the whole string so that the
# back-tracking can effectively perform a reverse search
$_ = "myscriptmycode";
/.*(my.*)/ and print "$1\n";

# reverse the string and the pattern
$_ = "myscriptmycode";
$_ = reverse;
/(.*?ym)/ and print scalar reverse($1), "\n";

Which one is better depends on the details.