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Full Discussion: Problem with use of the ? wildcard in regex substitution.
Top Forums UNIX for Dummies Questions & Answers Problem with use of the ? wildcard in regex substitution. Post 302858119 by ropers on Saturday 28th of September 2013 09:01:03 PM
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
 

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LEARN ABOUT PLAN9

mpm

MPM(6)								   Games Manual 							    MPM(6)

NAME

       mpm, mspe - macros for page makeup

SYNOPSIS

       troff -mpm file ...

       troff -mspe file ...

DESCRIPTION

       These  troff(1)	macros, largely compatible with ms(6), make better pages.  They silently invoke and provide information to a postprocessor
       that moves floating figures, avoids widows, and justifies pages vertically by stretching vertical spaces that result from  .PP,	.LP,  .IP,
       .QP, .SH, .NH, .DS/.DE, .EQ/.EN, .TS/.TE, .PS/.PE, .P1/.P2, and .QS/.QE.  The packages support different styles:

       -mpm   generic

       -mspe  Software--Practice and Experience

       The following macros are different from or not part of -ms.  Values denoted n have default value 1v.

       .BP    Begin a new page.
       .FL    Flush: force out previous keeps.
       .FC    Finish a two-column region and start a new one.
       .KF m  Floating keep, with preferred center at vertical position m.  Special values (default) and are permitted.
       .NE n  Start new page if remaining vertical space on this page is less than n.
       .P1    Begin a program display (constant width font).
       .P2    End a program display.
       .P3    Insert optional break point in program display.
       .SP n exactly
       .SP n  Insert vertical space of height n, stretchable unless exactly is present.
       .Tm text
	      Place page number and text on the standard error output.
       .X text
	      Present text to the hidden page-makeup program as part of a device-dependent output sequence x X text.  Equivalent to X'text'.

       Useful number registers:
       HM     Header margin; default 1 inch.
       FM     Footer margin; default 1 inch.
       FO     Footer position; default 10 inches.
       %#     Page number of current page.
       dP,dV  Shrinkage of point size and vertical spacing for .P1, in points.

       Useful strings:
       %e,%o  Even and odd page title commands, as .tl ''''.

FILES

       /sys/lib/tmac/tmac.pm
       /$cputype/bin/aux/pm

SOURCE

       /sys/src/cmd/pm

SEE ALSO

       ms(6), troff(1)
       B. W. Kernighan and C. J. Van Wyk, ``The -mpm Macro Package'', Unix Research System Programmer's Manual, Tenth Edition, Volume 2.

BUGS

       These features of -ms are missing:

	      Document styles other than the default .RP.
	      Space between front matter and first paragraph.  Recover it with .SP 2.
	      Separating rule above footnotes.
	      Keeps assigned to a separate page.
	      Pages with more than two columns.

       Troff option -o doesn't work with -mpm because only the postprocessor knows the page numbers.

																	    MPM(6)
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