Re: Regex question

You're being too specific. Your goal is simply to get the last thing between two slashes.

my ($dir) = m{/([^/]+)/[^/]*$};
[download]

Notice I changed the regexp's delimiters so I didn't have to escape the slashes.

I removed the if. That will set $dir to undef on failure. Add the if back if you want to keep $dir's previous value on failure.

Technically, you could omit the leading slash from the regexp, but I think it'll be more efficient with it.

Update: Since you mentioned you wanted to study my regexp further, what follows might help. Read from the comments from the bottom up.

my ($dir) = m{
               /        # Preceeded by a slash.
               ([^/]+)  # Preceeded by non-slashes, the dir. Captured.
               /        # Preceeded by a slash.
               [^/]*    # Preceeded by non-slashes, the file name.
               $        # End of string.
            }x;
[download]

Update: Oops! I forgot the parens around $dir. Added.

Comment on Re: Regex question Select or Download Code

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Re^2: Regex question by Roy Johnson (Monsignor) on Aug 19, 2005 at 03:12 UTC
Could also be done `m{./(.)/}` [download] Caution: Contents may have been coded under pressure.	[reply] [d/l]
Re^3: Regex question by radiantmatrix (Parson) on Aug 19, 2005 at 16:07 UTC
Or, to mirror the constraints in the OP's regex: `m{^.* / ([\w-]+) / .\.txt}x` [download] Also, the form: `my $dir; $dir = $1 if ##regex_here##` [download] is a good idiom to become familiar with. Updates:* 2005-08.Aug-22 : fixed short-sighted error tlm points out below. I keep getting bit on that. ;-) <-radiant.matrix-> Larry Wall is Yoda: there is no `try{}` (ok, except in Perl6; way to ruin a joke, Larry! ;P) The Code that can be seen is not the true Code "In any sufficiently large group of people, most are idiots" - Kaa's Law	[reply] [d/l] [select]
Re^4: Regex question by tlm (Prior) on Aug 19, 2005 at 17:45 UTC
Also, the form: `my $dir = $1 if ##regex_here##` [download] is a good idiom to become familiar with. Not with `my`, though. The behavior of `my ... if ...;` is undefined. the lowliest monk	[reply] [d/l]