Tricky,
You have most likely created an infinite loop:

while(@htmlLines)
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This is not likely what you wanted. You probably want to do a foreach loop where it will go through the array one time or shift the lines off one at a time. The reason being is because the array is being tested in scalar context - which for an array is the number of elements it contains. Unless the number of elements reaches 0 - this will loop forever.

Additionally - I don't think

if(/$pattern1 && $pattern2/)
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is what you wanted either. You probably want something more like: if (/$pattern1/ && /$pattern2/) once you defined $pattern1 and $pattern2 correctly.
Sorry - HTH

Cheers - L~R