I'm trying to figure out a multiline regex to:

1. Parse the following text: 

#EXTM3U
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=80000
80.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=400000
400.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=700000
700.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=1500000
1500.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=2500000
2500.m3u8

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2. Move the third set of lines, i.e.:
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=700000
700.m3u8

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to the top, right under #EXTM3U, so that it would show up as line 2. The other lines should be kept the same, just shifted down.

I've written the following:

$text = <<'LIST';
#EXTM3U
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=80000
80.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=400000
400.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=700000
700.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=1500000
1500.m3u8
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=2500000
2500.m3u8
LIST

$text =~ m{ (\#EXT-X-STREAM-INF:PROGRAM-ID=
                \d+,
                BANDWIDTH=\d+ \s*
                \d+\.m3u8)
         }xms;

print "1 - $1, 2 - $2, 3 - $3\n";

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which yields:

# ./test.pl
1 - #EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=80000
80.m3u8, 2 - , 3 -

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However, I'm not sure how to specify in the regex to split by: a) the first chunk being the top two entries, b) the second chunk being what I want to move, c) the last chunk. I figure once I have that, it's a simple matter of specifying $1, $2 and $3 in the replacement part of the regex.

Note that I realize I could split this into an array, but I'm trying to find an efficient regex to do the job here. Thoughts?

-- Burvil

In reply to Multiline regex for moving lines? by bowei_99

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