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Capturing groups in regular expressions enhance the search and replace functionality, allowing more powerful transformations. By defining a pattern with capturing groups, you can match specific text portions and use them in your replacement text, enabling flexible data sanitization and reformatting. This concept is straightforward and can be easily demonstrated with practical examples. For instance, using a file called "noisy numbers.txt," which contains mostly ten-digit numbers and some shorter ones, you can explore how capturing groups work in practice. Instructions for obtaining this file are provided in the video description.