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Problem with use of the ? wildcard in regex substitution.


 
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Top Forums UNIX for Dummies Questions & Answers Problem with use of the ? wildcard in regex substitution.
# 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:

Code:
    $ ls -1
    blar.m4mp3
    BLAH.mpmp3
    bar foo.m4mp3
    foo bar.mpmp3

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

Code:
    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.

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

This User Gave Thanks to Scott For This Post:
# 3  
Old 09-28-2013
A safe match is
Code:
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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