Christian Mayne
Christian Mayne
Spliting strings with awk / nawk
I mainly use nawk to extract elements from a string where I know the position (eg to get just the filenames when running a grep and I'm just too lazy to remember the correct grep syntax).
so, to extract field number x from strings in where the field separator (FS) is y:
$ nawk '{ FS="y"; print $x }'
Checking for a valid domainname
Very quick function to test a domain name is valid:
function validDomain($domain)
{
// Test domain is actually valid
if (preg_match('/^[a-z]+([a-z0-9-]*[a-z0-9]+)?(.([a-z]+([a-z0-9-]*[a-z0-9]+)?)+)*$/i', $domain))
{
return TRUE;
}
return FALSE;
}
The key here is the regular expression (delimited by the forward slashes at each end):
/^[a-z]+([a-z0-9-]*[a-z0-9]+)?(.([a-z]+([a-z0-9-]*[a-z0-9]+)?)+)*$/
This basically translates ...
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