[TriLUG] regex: match lines NOT containing X

[William Sutton]

erm, my bad.  If you're doing this Perl-wise, or anything  else that has 
the !~ operator as well as =~,

my @a = (
     "If two heads are better than one,",
     "are two keyboards better than one?",
     "Would you say the same if it were two hydra heads?"
);
foreach my $a (@a)
{
     print $a, "\n" if $a !~ m/heads/i;
}


William Sutton

On Wed, 22 Feb 2012, William Sutton wrote:

> Have you tried /[^(head)]/i ?
>
> William Sutton
>
> On Wed, 22 Feb 2012, Kevin Hunter wrote:
>
>> Hullo List,
>> 
>> An actual technical question here: Is there a way to match an entire line 
>> such that the entire line does *not* contain a sequence of characters?
>> 
>> Example input containing three lines:
>> -----
>> If two heads are better than one,
>> are two keyboards better than one?
>> Would you say the same if it were two hydra heads?
>> -----
>> 
>> My criteria is very specific: I want lines that do *not* contain 'heads'. 
>> My first thought was to use an assertion:
>> 
>> /^.*two.*(?!heads).*$/
>> 
>> However, this naive implementation matches both lines 2 and 3.  I've needed 
>> this construct more than a few times, so I'm almost sure it exists; I just 
>> don't know the right Google terms, apparently.  On the other hand, I could 
>> accept that this may not be possible in a single step regex.
>> 
>> Any ideas?
>> 
>> Thanks,
>> 
>> Kevin
>> -- 
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