Question $4$

Write a regular expression which matches line comments in Java. In Java, tline comments start with $//$ and read until they read a newline.

Question $5$

Write a regular expression which matches an XML tag in the form of $""$ where tog$\_$name and$\_$content can be any alpha$-$numeric string including letters, digits, and spaces only $($no symbols$).$

Question $6$

Although we $$sed a regular expression to answer question $5,$ briefly explain why, generally speaking, one shouldn't use a regular expression for parsing XML $($or HTML$).$