Question

Write a regular expression that generates each of the following language constructs:

(1) String constants with the following specifications:

A string constant consists of any sequence of characters enclosed by the quotation marks: “ and ”

The sequence may be empty.​

The sequence cannot span multiple lines.

Don’t worry about escape characters (assume that they won’t appear in the input).

(2) Multiple-line comment in C, C++ and JAVA with the following specifications:

The comment consists of any sequence of characters enclosed by the delimiters /* and */.

The sequence may be empty.

The sequence cannot have the * character.

Don’t worry about escape characters (assume that they won’t appear in the input).

Answer 1

1. \".*\"

Explanation: Here \" is for " character . is for any character except new line, * is for zero or more so .* means zero or more characters (multiple characters means string)

2. \/\*(.|\n)*\*\/

Explanation: Here \/ is for / character \* is for * character (.|\n) is for any character or linebreak and * is for zero or more so (.|\n)* means zero or more characters including linebreak

If you are directly copieng the regex it may not work since it has color and that color may include a hidden character into the current regex,so please try to type it instead of copy paste,Here is the two answers without any color/bold

1) \".*\"

2) \/\*(.|\n)*\*\/

PS-: If you have any problems/doubts please comment below.Thank you