Re: regex back matching

In article <Xns9AB467348BD9Fasu1cornelledu@xxxxxxxxx>, A. Sinan Unur
<1usa@xxxxxxxxxxxxxxxxxxx> wrote:

Ray Muforosky <muforo@xxxxxxxxx> wrote in news:8566add6-1bfc-4231-8242-
ba9790cf376f@xxxxxxxxxxxxxxxxxxxxxxxxxxxx:

On Jun 5, 8:14 am, Dan Rumney <danrum...@xxxxxxxxxxxxxxxx> wrote:
Ray Muforosky wrote:
Hello

I need to match on lines where the 4 quadrant of the ip is even with
one line regex.

  [snip]

What do you have so far? There are plenty of pages outlinging regexps
for matching IP addresses... that should prove a good start for you

egrep '^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.([stock here])\s*'
filename

What is egrep?

egrep is a version of the Unix grep program that does regular
expressions.

$ man egrep

"GREP(1)
NAME
grep, egrep, fgrep - print lines matching a pattern

SYNOPSIS
grep [options] PATTERN [FILE...]
grep [options] [-e PATTERN | -f FILE] [FILE...]

DESCRIPTION
Grep searches the named input FILEs (or standard input if no files are
named, or the file name - is given) for lines containing a match to the
given PATTERN. By default, grep prints the matching lines.

In addition, two variant programs egrep and fgrep are available. Egrep
is the same as grep -E. Fgrep is the same as grep -F."


So the OP is asking a question about a Unix utility in a Perl group.

--
Jim Gibson
.

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