Write a regular expression to describe each of the following programming languag

Question

Write a regular expression to describe each of the following programming language constructs:

(a) Any sequence of tabs and blanks (sometimes called white space). Use for tab, and require at least one space or tab.

(b) Comments in the C programming language. Recall that the only kind of comment in C /* looks like this */.

(c) String constants (without escape characters). An example would be to match “abcd” (with double-quotes). It does not need to support double-quotes inside the string. You only need support alphabetic characters inside the double-quotes.

Explanation / Answer

a) [ ]*

b) /*([^*]|[ ]|(*+([^*/]|[ ])))**+/

c) Double quotes don't have special meaning in regex, hence they can be directly matched as ".*", but if you are enclsoing this expression in some string in some language which keeps string enclosed in double quotes itself(like c++, Java) then you need to mark them with backslashes like ".*"

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.