April 2025
Intermediate to advanced
578 pages
13h 35m
Portuguese (Portugal, Brazil)
library(tidyverse)library(babynames)
Content preview from R for Data Science, 2ª Edição
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Capítulo 15. Expressões regulares
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Introdução
No Capítulo 14, aprendeste uma série de funções úteis para trabalhar com strings. Este capítulo irá focar-se em funções que utilizam expressões regulares, uma linguagem concisa e poderosa para descrever padrões dentro de strings. O termo expressão regular é um pouco complicado, por isso a maioria das pessoas abrevia-o para regex1 ou regexp.
O capítulo começa com as noções básicas de expressões regulares e as funções stringr mais úteis para a análise de dados. Em seguida, expandimos o teu conhecimento sobre padrões e cobrimos sete novos tópicos importantes (escape, ancoragem, classes de caracteres, classes de abreviaturas, quantificadores, precedência e agrupamento). Em seguida, falaremos sobre alguns dos outros tipos de padrões com os quais as funções stringr podem trabalhar e os vários "sinalizadores" que te permitem ajustar a operação das expressões regulares. Terminaremos com uma pesquisa de outros lugares no tidyverse e na base R onde poderás usar regexes.
Pré-requisitos
Neste capítulo, vamos utilizar funções de expressão regular do stringr e do tidyr, ambos membros centrais do tidyverse, bem como dados do pacote babynames:
Ao longo deste capítulo, vamos utilizar uma mistura de exemplos simples em linha para que possas ter uma ideia básica, os dados de nomes de bebés e ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.