1. Write a regular expression to find the set of all strings with two consecutive repeated words (e.g., “Humbert Humbert” and “the the” but not “the bug” or “the big bug”) that may occur in a Text. 2. Write a regular expression to find all strings that start at the beginning of the line with an integer and that end at the end of the line with a word in the Text.

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Methods of StringBuilder class

The StringBuilder class can be used to create mutable strings. The methods defined in the StringBuilder class are widely used to manipulate and concatenate strings. It is a non-synchronized class which has public methods that can be accessed by multiple threads. It is not thread-safe.