I'm trying to write sed expression which will extract matching groups from file.
E.g. I have .cue sheet and I want to extract it's genre tag. It has following format:
$ cat file.cue | grep GENRE
REM GENRE "POP"
I've created sed expression to extract this tag and replace quotes around it:
$ sed -e 's/REM[ \t]*GENRE[ \t]*\(.*\)/\1/;s/"\(.*\)"/\1/;q' file.cue
POP
My question is why if it's failed to find matching group it will just print first string?
$ sed -e 's/REMerror[ \t]*GENRE[ \t]*\(.*\)/\1/;s/"\(.*\)"/\1/;q' file.cue
REM GENRE POP
Example of cue-sheet:
REM GENRE "POP"
REM DATE 2012
REM DISCID EC10BD10
REM COMMENT "ExactAudioCopy v0.99pb5"
PERFORMER "JAM Project"
TITLE "JAM Project BEST COLLECTION IX THE MONSTERS"
FILE "LACA-15250.flac" WAVE
TRACK 01 AUDIO
TITLE "THE MONSTERS"
PERFORMER "JAM Project"
INDEX 01 00:00:00