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Finding_and_summarizing_colossal_files/lessons/02_Regular_expressions.md

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+---
+title: "Regular Expressions"
+author: "Will Gammerdinger"
+---
+
 # Regular Expressions
 
 Regular expressions (sometimes referred to as regex) are a string of characters that can be used as a pattern to match against. This can be very helpful when searching through a file, particularly in conjunction with `sed`, `grep` or `awk`. Since we have an understanding of `grep` from previous workshops we are going to use `grep` and the `catch.txt` file that we downloaded to demonstrate the principles of regular expressions. As we said though, many of these principles are also useful in `sed` and `awk`.