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Introduction to String Matching and Modiﬁcation in R Using Regular Expressions Regular expressions allow us to do that by describing a set of characters. Note regular expression implementations. Note Ranges are inclusive. Regular Expressions Cheat Sheet Author: Dave Child Created Date: 6/30/2008 9:43:00 AM

Lecture 18 Regular Expressions Many of today’s web applications require matching patterns in a text document to look for specific information. Regular expression • (abbreviated regex or regexp) a search pattern, mainly for use in pattern matching with strings, i.e. "find and replace"-like operations.

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