Hi all,
I have got a regular expression of the form: "tcp:"+'[0-9]+'
It works fine when using the re.search( ) module. But if I want to grep for a line in a file that contains the pattern required, then the things wont work. Grep sees the regualr expression as tcp:+[0-9]. Hence grep will look for tcp:+[0-9]
How to make it ensured that grep will search for a pattern defined by the regular expression: "tcp:"+'[0-9]+'
Regards,
Prashanth
If you are speaking of linux' grep command, it does not use the same regexes as python. It uses posix regular expression. You should use grep -E and see http://www.regular-expressions.info/posix.html#bre or google for more info on the supported regexes.
Another solution is to use the grin program http://pypi.python.org/pypi/grin which is a grep written in python and which uses python's regexes on the command line. On some linux systems, it's a package (you should install it with your software manager). Otherwise you should be able to install it with easy_install on the command line.
You can use the grin command like the grep command, but with a python regex. Here is the output of grin -h :
usage: grin [-h] [-v] [-i] [-A AFTER_CONTEXT] [-B BEFORE_CONTEXT] [-C CONTEXT]
[-I INCLUDE] [-n] [-N] [-H] [--without-filename] [-l] [-L]
[--no-color] [--use-color] [--force-color] [-s]
[--skip-hidden-files] [-b] [--skip-backup-files] [-S]
[--skip-hidden-dirs] [-d SKIP_DIRS] [-D] [-e SKIP_EXTS] [-E]
[-f FILE] [-0]
regex [files [files ...]]
Search text files for a given regex pattern.
positional arguments:
regex the regular expression to search for
files the files to search
optional arguments:
-h, --help show this help message and exit
-v, --version show program's version number and exit
-i, --ignore-case ignore case in the regex
-A AFTER_CONTEXT, --after-context AFTER_CONTEXT
the number of lines of context to show after the match
[default=0]
-B BEFORE_CONTEXT, --before-context BEFORE_CONTEXT
the number of lines of context to show before the
match [default=0]
-C CONTEXT, --context CONTEXT
the number of lines of context to show on either side
of the match
-I INCLUDE, --include INCLUDE
only search in files matching this glob [default='*']
-n, --line-number show the line numbers [default]
-N, --no-line-number do not show the line numbers
-H, --with-filename show the filenames of files that match [default]
--without-filename do not show the filenames of files that match
-l, --files-with-matches
show only the filenames and not the texts of the
matches
-L, --files-without-matches
show the matches with the filenames
--no-color do not use colorized output [default if piping the
output]
--use-color use colorized output [default if outputting to a
terminal]
--force-color always use colorized output even when piping to
something that may not be able to handle it
-s, --no-skip-hidden-files
do not skip .hidden files
--skip-hidden-files do skip .hidden files [default]
-b, --no-skip-backup-files
do not skip backup~ files
--skip-backup-files do skip backup~ files [default]
-S, --no-skip-hidden-dirs
do not skip .hidden directories
--skip-hidden-dirs do skip .hidden directories [default]
-d SKIP_DIRS, --skip-dirs SKIP_DIRS
comma-separated list of directory names to skip
[default='CVS,RCS,.svn,.hg,.bzr,build,dist']
-D, --no-skip-dirs do not skip any directories
-e SKIP_EXTS, --skip-exts SKIP_EXTS
comma-separated list of file extensions to skip
[default='.pyc,.pyo,.so,.o,.a,.tgz']
-E, --no-skip-exts do not skip any file extensions
-f FILE, --files-from-file FILE
read files to search from a file, one per line; - for
stdin
-0, --null-separated filenames specified in --files-from-file are separated
by NULsHi Gribouillis,
Thanks for the reply.
My requirement is that the grep command is executed by a ssh process connecting to a server. It executes this grep command on the server. Hence it is liux kind of enironment. For grep I found out that a number can be represented as "[0-9] [\d]*". But even this did not work
Regards,
Prashanth
If you are speaking of linux' grep command, it does not use the same regexes as python. It uses posix regular expression. You should use grep -E and see http://www.regular-expressions.info/posix.html#bre or google for more info on the supported regexes.
Another solution is to use the grin program http://pypi.python.org/pypi/grin which is a grep written in python and which uses python's regexes on the command line. On some linux systems, it's a package (you should install it with your software manager). Otherwise you should be able to install it with easy_install on the command line.
You can use the grin command like the grep command, but with a python regex. Here is the output ofgrin -h:usage: grin [-h] [-v] [-i] [-A AFTER_CONTEXT] [-B BEFORE_CONTEXT] [-C CONTEXT] [-I INCLUDE] [-n] [-N] [-H] [--without-filename] [-l] [-L] [--no-color] [--use-color] [--force-color] [-s] [--skip-hidden-files] [-b] [--skip-backup-files] [-S] [--skip-hidden-dirs] [-d SKIP_DIRS] [-D] [-e SKIP_EXTS] [-E] [-f FILE] [-0] regex [files [files ...]] Search text files for a given regex pattern. positional arguments: regex the regular expression to search for files the files to search optional arguments: -h, --help show this help message and exit -v, --version show program's version number and exit -i, --ignore-case ignore case in the regex -A AFTER_CONTEXT, --after-context AFTER_CONTEXT the number of lines of context to show after the match [default=0] -B BEFORE_CONTEXT, --before-context BEFORE_CONTEXT the number of lines of context to show before the match [default=0] -C CONTEXT, --context CONTEXT the number of lines of context to show on either side of the match -I INCLUDE, --include INCLUDE only search in files matching this glob [default='*'] -n, --line-number show the line numbers [default] -N, --no-line-number do not show the line numbers -H, --with-filename show the filenames of files that match [default] --without-filename do not show the filenames of files that match -l, --files-with-matches show only the filenames and not the texts of the matches -L, --files-without-matches show the matches with the filenames --no-color do not use colorized output [default if piping the output] --use-color use colorized output [default if outputting to a terminal] --force-color always use colorized output even when piping to something that may not be able to handle it -s, --no-skip-hidden-files do not skip .hidden files --skip-hidden-files do skip .hidden files [default] -b, --no-skip-backup-files do not skip backup~ files --skip-backup-files do skip backup~ files [default] -S, --no-skip-hidden-dirs do not skip .hidden directories --skip-hidden-dirs do skip .hidden directories [default] -d SKIP_DIRS, --skip-dirs SKIP_DIRS comma-separated list of directory names to skip [default='CVS,RCS,.svn,.hg,.bzr,build,dist'] -D, --no-skip-dirs do not skip any directories -e SKIP_EXTS, --skip-exts SKIP_EXTS comma-separated list of file extensions to skip [default='.pyc,.pyo,.so,.o,.a,.tgz'] -E, --no-skip-exts do not skip any file extensions -f FILE, --files-from-file FILE read files to search from a file, one per line; - for stdin -0, --null-separated filenames specified in --files-from-file are separated by NULs
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