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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igawk

IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME

       igawk - gawk with include files

SYNOPSIS

       igawk [ all gawk options ] -f program-file [ -- ] file ...
       igawk [ all gawk options ] [ -- ] program-text file ...

DESCRIPTION

       Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1).

       AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like

	      @include getopt.awk

       in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path.

OPTIONS

       See gawk(1) for a full description of the AWK language and the options that gawk supports.

EXAMPLES

       cat << EOF > test.awk
       @include getopt.awk

       BEGIN {
	    while (getopt(ARGC, ARGV, "am:q") != -1)
		 ...
       }
       EOF

       igawk -f test.awk

SEE ALSO

       gawk(1)

       Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995.

AUTHOR

       Arnold Robbins (arnold@skeeve.com).

Free Software Foundation					    Nov 3 1999								  IGAWK(1)