you're writing C style perl, but for #1 the |= operand should work fine. Though you don't need all those leading zeroes, unless you think it helps you read the function better, you could just do  $a |= 0x8;

You can't change the value of $a by using it as a function parameter in MyGetFunc. You'll want to either return that as a value, or pass in a reference to the variable, and access it directly. ex.  $a = MyGetFunc() would change the value of $a, but passing it to a function would not, unless you passed a reference to $a.

Not sure I understand the whole question, what are you asking about regarding a regex? Are you extracting some string? And are they seperated by attribute:string: value? If so , then you may just need to use split on the colon delimiter and store the values separately.) (then use the perl function "hex" to convert a string of hexadecimal digits to a hex integer value)

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