start of line in backward assertion/circumflex in square brackets/ character class

my prob is parsing a querystring in php, that can start with
a '?' or
with nothing(case1/2):

case1:
	$data="?name=somthing&type=else&community=com
munityABC&";
case2
	$data="name=somthing&type=else&community=comm
unityABC&";

i try to make a backward assertion, but it seems not to
recognize the
\\^ as line start in the character class there:

	$strParamPattern="/(?<=[?\\^&;]{0,1})[^=?&am
p;;]+=[^=?&;\\$]+(?=[\\$&;])/";

	preg_match_all($strParamPattern, $data, $result,
PREG_SET_ORDER);

in case1 i get the correct 3 results, in case2 the first one
is
missing.
this arouse the question to me: is it possible to include
the start of
line-circumflex in a character-class?

same question for the end-of-line-$, as it seems of no
difference if i
use '\\$' or '$' in the later character classes.

thanks for your suggestions.


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