This class can be used to search files in directories like the Unix command grep.
It can traverse a given directory recursively and search for a given text the contents of files with a given list of file name extensions.
The path of the files that have the given text is stored in a class array variable and the class returns the number of occurrences.
The idea of the class was inspired on the Grep Simulator class written by Er. Rochak Chauhan.
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