It's plausible that putting the object's "content" method in a while l
+oop has the effect of <br>resetting the regex engine's pointer back t
+o the beginning of the string on each iteration.

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thank you, graff , that's probably the cause of the problem. I haven't found much on that topic yet. but putting the $resp->content into a scalar before the while loop solve the problem.

btw, the $resp is a response object from LWP module,like this 

 $br = LWP::UserAgent->new;
 $resp = $br->get("http://www.example.com");

In reply to Re: Re: backreference question. by Qiang
in thread backreference question. by Qiang

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