Case based critical thinking Case 13-5 William is exploring the syntax of regular expressions. He learns that in the regular expression language, a word refers to any string of symbols consisting solely of word characters. He also learns that word boundaries are indicated by the \b symbol. He wants to use a pattern that matches any word that starts with the characters "great" such as "greater", "greatness", or "greatest" Which of the following patterns should William use to match any word that ends with "ust" such as "dust", "trust", or "must"?
A) /ust\b/
B) /\bust/
C) \bust/
D) /b\ust/

Question

Quizplus · Accepted Answer

William needs to match any word that ends with "ust" and since "ust" is at the end of the word, he should use the symbol for end of line "$". However, none of the options have the symbol "$". Option A, /ust\b/, has the correct ending pattern "\b" for a word boundary and matches "ust" at the end of any word, which is what William needs. The other options do not include the word boundary symbol or have it in the wrong position, making them incorrect choices.

Case Based Critical Thinking Case 13-5 William Is Exploring the Syntax