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In this video on regular expressions, the focus is on the replace function. The presenter reflects on the series of videos about regular expressions, emphasizing that this is the last one in the current sequence. The replace function is utilized by calling it on a string and providing a regular expression that matches specific patterns. Upon finding a match, the function replaces it with a specified substitute, similar to the find and replace feature in text editors. This builds on the previous video, which covered the split function, where a regular expression identifies a delimiter for dividing text into an array of chunks or tokens.
