grep() returns the indices into the character vector that contain a match or the specific strings that happen to have the match. Grep(), grepl(): These functions search for matches of a regular expression/pattern in a character vector. The primary R functions for dealing with regular expressions are 22.4 Example: Bootstrapping a Statistic.21.3.2 Changes in PM levels at an individual monitor.21.2 Loading and Processing the Raw Data.21 Data Analysis Case Study: Changes in Fine Particle Air Pollution in the U.S.15.3 Lexical Scoping: Why Does It Matter?.15.1 A Diversion on Binding Values to Symbol.12.3.1 Common dplyr Function Properties.12 Managing Data Frames with the dplyr package.9.5 Extracting Multiple Elements of a List.9.4 Subsetting Nested Elements of a List.7 Using Textual and Binary Formats for Storing Data.5.4 Calculating Memory Requirements for R Objects.5.3 Reading in Larger Datasets with read.table.5.2 Reading Data Files with read.table().3.2 Getting started with the R interface.
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