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It will match nothing (unless the string is changed to the single word bells).

Notice that for ^bells$ to match the string bells there must not be any spaces at the beginning or end of the string.

Matching Word Boundaries

Regular Expression
(Delimit with quotes)
(Delimit with quotes)

Sometimes you want to find a word, not a substring that is part of a larger word. Use \b to match a word boundary. Usually a word boundary is whitespace (blanks, tabs, and a few other characters). But word boundaries also include the beginnings and ends of lines, cases which are otherwise easily overlooked when searching through a text file.

To match a non-word boundary, use \B in the expression. To find the substring cat that is embedded within another word use \Bcat\B


Write a regular expression that matches complete words that begin with the prefix cat .