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One of the most widely used applications of regular expressions is search and replace, enhanced by the concept of capturing groups. This allows you to define parts of your pattern and use the matching text in your replacement, enabling more flexible data sanitization and reformatting than standard methods. The idea of capturing groups is straightforward, and the tutorial provides examples for practical understanding. It uses the "noisy_numbers.txt" file, which contains primarily ten-digit numbers with some shorter numbers included, illustrating how to effectively manipulate this type of data. Instructions for obtaining the file are available in the video's description.