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one of regular expressions most widely used applications is search and replace but its a more powerful search and replace than youre used to thanks to this idea called capturing groups so with a capturing group youre able to say heres part of my pattern then whatever text matches this part of the pattern I want to be able to use that in my replacement text when we go to replace this gives us the ability to sanitize and reformat data much more flexibly than you can do without it it turns out this is actually a very straightforward idea so lets jump right into it with some examples you can follow along lets explore capturing groups in the context of the file noisy numbers dot txt if you dont have this file yet to be used in previous videos you can find some instructions in the description of this video on how to get it this file is made up of mostly ten digit numbers but there are a few numbers that are fewer than ten digits so lets imagine that this is some data that weve reco