During an investigation of an xss attack, the investigator comes across the term "[a-za-z0-9\%]+" in analyzed evidence details. what is the expression used for?

It means that, during the investigation of an xss attack, an analysis of all uppercase letters from "A" to "Z" will occur, all lowercase letters from "a" to "z", all numbers from 0-9 and the "%" symbol. If the analyzed file has any character that is different from those mentioned above, the analysis will not capture it and it will be ignored, which may indicate that the file contains malicious objectives inside the machine.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation: