09-21-2011
Perl : how to match non-empty string that has no spaces
Hi Everyone,
I am looking for neat way to grep a non-empty string that basically contains a hostname, which might be in FWDN form or without the domain, for example:
hostname.internal.domainname.net
The file I am parsing contains blan lines (^$) and also series of "-" which in other places are used as separator (-----------------------).
As you of course know hyphen ("-") may well occur in a hostname.
if (/\S/) - is not good as it catches "--------------" too
if (! /\s/) - is not good either for the same reason
I was playing with regexes like: /[A-Za-z0-9.-]+/ but couldn't get what I actually need. That matched series of hyphens either. I need a regex that would allow for hyphens but denied "hyphens only". In other words hyphens are permitted but only when there are other letters as well.
I was able to get around my problem using two or three if... tests but this problem is still sitting in the back of my head.
I think I made my explanation unclear... apologies for that. Be sure I'll be seeking for answer myself too
Kind regards to Everyone.
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ypcat(1) General Commands Manual ypcat(1)
NAME
ypcat - print values of all keys in a NIS database
SYNOPSYS
ypcat [ -kt ] [ -d domain ] [ -h hostname ] mapname
ypcat -x
DESCRIPTION
ypcat prints the values of all keys from the NIS database specified by mapname, which may be a map name or a map nickname.
OPTIONS
-d domain
Specify a domain other than the default domain as returned by domainname(1).
-h hostname
Specify a hostname other than the default one as found by ypbind(8).
-k Display map keys. This option is useful with maps in which the values are null or the key is not part of the value.
-t This option inhibits map nickname translation.
-x Display the map nickname translation table.
FILES
/var/yp/nicknames
map nickname translation table.
SEE ALSO
domainname(8), nicknames(5), ypbind(8), ypmatch(1), yppoll(8), ypserv(8), yset(8), ypwhich(1)
AUTHOR
ypcat is part of the yp-tools package, which was written by Thorsten Kukuk <kukuk@suse.de>.
YP Tools 2.7 December 2001 ypcat(1)