http://qs321.pair.com?node_id=49115


in reply to Code Smarter

So, what's the best way to find of a string ends with a given substring?

On another thread I posted example code for finding all your .mp3 files, and I used rindex, but I dawned on me later that that would also find false negatives like: "foo.mp3.gif"

So what's the best replacement for m/.mp3$/?

Tony

Replies are listed 'Best First'.
Re: Re: Code Smarter
by I0 (Priest) on Dec 31, 2000 at 22:41 UTC
    m/\.mp3$/or substr($_,-4)eq".mp3"
[reply]
[d/l]
[select]
      Anyone know which of these is the faster expression (intuitively speaking, not looking for a benchmark)? Doesn't the RE have to do a lot of work to get to the end of each string passed, whereas substr simply clips? The only thing to remember is to either test .MP3 as well or do lc() on the substr().
[reply]
        My Benchmark shows the RE slightly faster.
[reply]

In Section Meditations