Problem with use of the ? wildcard in regex substitution.

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# 1  
Old 09-28-2013
Problem with use of the ? wildcard in regex substitution.

I'm trying to use Larry Wall's rename (prename) tool to rename multiple files:

    $ ls -1
    bar foo.m4mp3
    foo bar.mpmp3

I'm trying to fix the extensions so they're all .mp3:

    rename 's/m?mp3/mp3/' *mp3

I expect m?mp3 to match the extensions, and I expect them to be substituted with mp3. But I can't seem to get it to match and work correctly.

What am I doing wrong?

Last edited by Scott; 09-28-2013 at 10:05 PM.. Reason: Code tags
# 2  
Old 09-28-2013
In a regular expression ? matches 0 or 1 of the preceding expression. If you want to match (almost) any character, try using . (period) instead.

rename 's/m.mp3/mp3/' *mp3

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# 3  
Old 09-28-2013
A safe match is
rename 's/\.m.mp3$/.mp3/' *mp3

Last edited by MadeInGermany; 09-28-2013 at 10:36 PM..
This User Gave Thanks to MadeInGermany For This Post:
# 4  
Old 09-28-2013
Thank you very much. That was confusing.
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