Regex Character Class bug?

[Defcon5]

I can't figure out why the following does not work.

if('CCTAGG' =~ /[^A]/) {
	print "match";
}

I would expect that it would not match because the string has a A in it. But it DOES match. Can someone explain this to me?

When I remove the carrot (^), than it also matches. Which I expect because the string contains a "A".

When I change the "A" to a "X", it doesn't match anymore, as expected.

Thanks,

Jesse

 

[ishnid]

That regexp isn't doing what you think it should be doing. It will match if the string `CCTAGG' contains *any* character that isn't an `A'. Since it contains 5 such characters, it'll match. What you want is:

if('CCTAGG' !~ /A/ ) {

}

 

[TrojanWarBlade]

To get the effect I think you want you need to change your code to this:

if('CCTAGG' [red]![/red]~ /A/) {
    print "match";
}

Looks like more genetic code. ;-)

Trojan.

 

[Defcon5]

Thanks for the replies.

The problem was that Regex stops at the first hit in the previous example. So it saw a "C" as first character, and than checked it against "[^A]" and immediately stopped searching further.


I fixed it by doing this:

if('CCTAGG' =~ /^[^A]*$/) {
    print "match";
}