Hi Karim and Ktu,
Below is an explanation of what appears to be going on in the given pattern:
(?:\s*)
is a greedy non-capturing group of whitespace
(?<=[-|/])
is looking behind the next section of the expression, (?<name>\w*),
for, what is in this case, a character set; as well, it does so
without including it in the result. In this case the character
set could also be written without the |, resulting in [-/]
(?<name>\w*)
is looking for name>\w*, before the next expression [:|=]
you may have wanted (?P<name>\w*)
[:|=]
is a character set : or =, but again does not need the |,
and could be [:=] or something like (?::|=)
("((?<value>.*?)(?<!\\)")|(?<value>[\w]*))
is what I think you may have wanted to be an alternation,
and in another language it would have worked; however, not in AS3.
Apparently in AS3 in order to distinguish the syntax from a
lookbehind ?< you need to use the syntax ?P<desiredGroupName>
when defining a named group; as well, it is due to the fact that,
as far as I know, in AS3 you cannot use names of the same group
even a logical OR alternation.
On 3/11/2011 2:37 PM, Ktu wrote:
I just plugged it into RegExr<http://www.regexr.com> and I can't make sense
of it.
Try using that tool to build it. It really helps
On Fri, Mar 11, 2011 at 5:56 AM, Karim Beyrouti<[email protected]> wrote:
Hello lovely list...I am trying to run a RegExp pattern on a String, and am
not too sure why it's not working, and am not too sure why.
Here is the code:
var tStr : String = '/a:"value" -big="this" -test:123
-test2=th_3'
var r : RegExp = new RegExp(
'(?:\s*)(?<=[-|/])(?<name>\w*)[:|=]("((?<value>.*?)(?<!\\)")|(?<value>[\w]*))');
var result : Object = r.exec( str );
result returns null... Maybe you can shed some light on what i am doing
wrong here?
Thanks...
Karim
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