awk equivalent of regex Post: 302590904

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Top Forums Shell Programming and Scripting awk equivalent of regex Post 302590904 by aigles on Wednesday 18th of January 2012 03:05:59 AM

01-18-2012

Registered User

Quote:

Originally Posted by r4v3n

Hi A!,

For some reason, your code doesn't give me any output on my machine. I'm running Ubuntu 10.04 with GNU Awk 3.1.6 Smilie

From gawk documentation :

Quote:

However, because old programs may use �{' and �}' in regexp constants, by
default gawk does not match interval expressions in regexps. If either �--posix'
or �--re-interval' are specified (see Section 11.2 [Command-Line Options],
page 177), then interval expressions are allowed in regexps.
For new programs that use �{' and �}' in regexp constants, it is good practice
to always escape them with a backslash. Then the regexp constants are valid
and work the way you want them to, using any version of awk.2

Try :

Code:

awk '{ if($0 ~ /^http:\/\/[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]{1,3}\.[0-9]\{1,3\}(:[0-9]\{1,5\})?/) print $0}' f7

I test the original awk command with some versions of awk :

Solaris /usr/bin/awk : No output
Solaris /usr/bin/nawk : No output
Solaris /usr/xpg4/bin/awk : Ok.
Aix : /usr/bin/awk : Ok.

Jean-Pierre.

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LEARN ABOUT BSD

ucblinks

ucblinks(1B)					     SunOS/BSD Compatibility Package Commands					      ucblinks(1B)

NAME

       ucblinks - adds /dev entries to give SunOS 4.x compatible names to SunOS 5.x devices

SYNOPSIS

       /usr/ucb/ucblinks [-e rulebase] [-r rootdir]

DESCRIPTION

       ucblinks  creates symbolic links under the /dev directory for devices whose SunOS 5.x names differ from their SunOS 4.x names. Where possi-
       ble, these symbolic links point to the device's SunOS 5.x name rather than to the actual /devices entry.

       ucblinks does not remove unneeded compatibility links; these must be removed by hand.

       ucblinks should be called each time the system is reconfiguration-booted, after any new SunOS 5.x links that are needed have been  created,
       since the reconfiguration may have resulted in more compatibility names being needed.

       In  releases prior to SunOS 5.4, ucblinks used a  nawk rule-base to construct the SunOS 4.x compatible names. ucblinks no longer uses  nawk
       for the default operation, although  nawk rule-bases can still be specifed with the -e option.  The  nawk rule-base equivalent to the SunOS
       5.4 default operation can be found in /usr/ucblib/ucblinks.awk.

OPTIONS

       -e rulebase     Specify rulebase as the file containing nawk(1) pattern-action statements.

       -r rootdir      Specify rootdir as the directory under which dev and devices will be found, rather than the standard root directory /.

FILES

       /usr/ucblib/ucblinks.awk        sample rule-base for compatibility links

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       devlinks(1M), disks(1M), ports(1M), tapes(1M), attributes(5)

SunOS 5.10							    13 Apr 1994 						      ucblinks(1B)