Python re.findall inverse Match Post: 302965626

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Top Forums Programming Python re.findall inverse Match Post 302965626 by durden_tyler on Monday 1st of February 2016 10:34:35 AM

02-01-2016

Registered User

Quote:

Originally Posted by metallica1973

...I am used to using "!" or boolean "not" but have never done it using Pythons "re" module. ...

Yes, Python uses the more verbose "not" instead of "!" for negative regex matches.

Code:

$
$ cat pkg_list.txt
'zssh (1.5c.debian.1-3.2+b1 [s390x], 1.5c.debian.1-3.2 [amd64, arm64, armel, armhf, i386, mips, mipsel, powerpc, ppc64el])',
'zsync (0.6.2-1)',
'zzuf (0.13.svn20100215-4.1+b1 [s390x], 0.13.svn20100215-4.1 [amd64, arm64, armel, armhf, i386, mips, mipsel, powerpc, ppc64el])']
'ztex-bmp (20120314-2)',
$
$ cat -n negative_match.py
     1  #!/usr/bin/python
     2  import re
     3  input_file = "pkg_list.txt"
     4  for line in open(input_file):
     5      if not re.match('.*\[s390x\].*', line):
     6          print line,
     7
$
$ python negative_match.py
'zsync (0.6.2-1)',
'ztex-bmp (20120314-2)',
$
$

For reference, here's the corresponding regex in Perl:

Code:

$
$ perl -lne 'print if !/\[s390x\]/' pkg_list.txt
'zsync (0.6.2-1)',
'ztex-bmp (20120314-2)',
$
$ perl -lne 'print if not /\[s390x\]/' pkg_list.txt
'zsync (0.6.2-1)',
'ztex-bmp (20120314-2)',
$
$

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LEARN ABOUT DEBIAN

transition-check

TRANSITION-CHECK(1)													       TRANSITION-CHECK(1)

NAME

       transition-check - check a package list for involvement in transitions

SYNOPSIS

       transition-check --help|--version

       transition-check [-f|--filename=FILENAME] [source package list]

DESCRIPTION

       transition-check checks whether any of the listed source packages are involved in a transition for which uploads to unstable are currently
       blocked.

       If neither a filename nor a list of packages is supplied, transition-check will use the source package name from debian/control.

OPTIONS

       -f, --filename=filename
	   Read a source package name from filename, which should be a Debian package control file or .changes file, and add that package to the
	   list of packages to check.

EXIT STATUS

       The exit status indicates whether any of the packages examined were found to be involved in a transition.

       0   Either --help or --version was used, or none of the packages examined was involved in a transition.

       1   At least one package examined is involved in a current transition.

LICENSE

       This code is copyright by Adam D. Barratt <adam@adam-barratt.org.uk>, all rights reserved.

       This program comes with ABSOLUTELY NO WARRANTY.	You are free to redistribute this code under the terms of the GNU General Public License,
       version 2 or later.

AUTHOR

       Adam D. Barratt <adam@adam-barratt.org.uk>

Debian Utilities						    2013-12-23						       TRANSITION-CHECK(1)