Including "End of String" in character class?

doran has asked for the wisdom of the Perl Monks concerning the following question:

I'm parsing an mp3 stream to pull out the title of the song. To do this, I have this regex:

$line =~ m/StreamTitle='(.*?)';/i;

This is fine if the line is something like this:

{<F-#f]?o!StreamTitle='Five Keys - Girl You Better Stop It';wFU1*

For reasons I'm not sure of, sometimes the line is truncated and doesn't have the closing ';, so I need regex which says grab everything after StreamTitle=' up until '; or the end of line, whichever comes first. It's as if I need to include the end of string in a character class, but doing something like [;\Z] doesn't work. I'm sure there must be a way, but don't know how.

Thanks in advance.

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Re: Including "End of String" in character class? by Fletch (Bishop) on Mar 16, 2007 at 19:05 UTC
Perhaps `/StreamTitle='(.*?)(?=';\|\z)/` might work?	[reply] [d/l]
Re^2: Including "End of String" in character class? by doran (Deacon) on Mar 16, 2007 at 19:14 UTC
Works like a charm. Thanks!	[reply]
Re: Including "End of String" in character class? by ikegami (Patriarch) on Mar 16, 2007 at 19:16 UTC
If you extend what you already have, `$line =~ m/StreamTitle='(.?)(?:'\|\z)/i;` or just `$line =~ m/StreamTitle='(.?)'?/i;` However, if you replace the `.?` with the more predictable `[^']`, you don't even have to match the end quote: `$line =~ m/StreamTitle='([^'])/i;` Update: I knew I avoided `.?` for a reason. Struck out a bad "solution".	[reply] [d/l] [select]
Re^2: Including "End of String" in character class? by doran (Deacon) on Mar 16, 2007 at 19:31 UTC
Thanks ikegami. Indeed, after some testing, that last one seems to be best.	[reply]
Re: Including "End of String" in character class? by japhy (Canon) on Mar 17, 2007 at 02:11 UTC
Just a friendly reminder... if it ain't a character, it don't go in a character class. Jeff `japhy` Pinyan, P.L., P.M., P.O.D, X.S.: Perl, regex, and `perl` hacker How can we ever be the sold short or the cheated, we who for every service have long ago been overpaid? ~~ Meister Eckhart	[reply]
Re: Including "End of String" in character class? by shigetsu (Hermit) on Mar 16, 2007 at 19:19 UTC
Assuming you'd save the stream to a file, you could use MP3::M3U to parse the absolute paths of each song and hand them over to MP3::Tag. (just for the records)	[reply]
Re^2: Including "End of String" in character class? by doran (Deacon) on Mar 16, 2007 at 19:26 UTC
Unfortunately MP3::M3U is for playlists, and I'm parsing a stream, so there's no file. Thanks though.	[reply]


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