{"id":954,"date":"2023-07-28T04:57:15","date_gmt":"2023-07-28T04:57:15","guid":{"rendered":"https:\/\/statorials.org\/pt\/grep-vs-grep-r\/"},"modified":"2023-07-28T04:57:15","modified_gmt":"2023-07-28T04:57:15","slug":"grep-vs-grep-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/grep-vs-grep-r\/","title":{"rendered":"Compara\u00e7\u00e3o de grep() e grepl() em r: qual a diferen\u00e7a?"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Duas fun\u00e7\u00f5es que as pessoas costumam confundir em R s\u00e3o <strong>grep()<\/strong> e <strong>grepl()<\/strong> . Ambas as fun\u00e7\u00f5es permitem ver se existe um determinado padr\u00e3o em uma string, mas retornam resultados diferentes:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>grepl()<\/strong> retorna TRUE quando existe um padr\u00e3o em uma string.<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>grep()<\/strong> retorna um vetor de \u00edndices de string contendo o padr\u00e3o.<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">O exemplo a seguir ilustra essa diferen\u00e7a:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create a vector of data<\/span>\ndata &lt;- c('P Guard', 'S Guard', 'S Forward', 'P Forward', 'Center')\n\n<span style=\"color: #3366ff;\">grep<\/span> ('Guard', data)\n[1] 1 2\n\n<span style=\"color: #3366ff;\">grepl<\/span> ('Guard', data) \n[1] TRUE TRUE FALSE FALSE FALSE<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Os exemplos a seguir mostram quando voc\u00ea pode querer usar uma dessas fun\u00e7\u00f5es em vez da outra.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Quando usar grepl()<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\"><strong>1. Filtre as linhas que cont\u00eam uma determinada string<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">Um dos usos mais comuns de <strong>grepl()<\/strong> \u00e9 filtrar linhas em um quadro de dados contendo uma determinada string:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\">library(dplyr)<\/span>\n\n#create data frame<\/span>\ndf &lt;- data.frame(player = c('P Guard', 'S Guard', 'S Forward', 'P Forward', 'Center'),\n                 points = c(12, 15, 19, 22, 32),\n                 rebounds = c(5, 7, 7, 12, 11))\n\n<span style=\"color: #008080;\">#filter rows that contain the string 'Guard' in the player column\n<\/span><span style=\"color: #000000;\">df %&gt;% filter( <span style=\"color: #3366ff;\">grepl<\/span> ('Guard', player))\n\n   player points rebounds\n1 P Guard 12 5\n2 S Guard 15 7<\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><strong>Relacionado:<\/strong> <a href=\"https:\/\/statorials.org\/pt\/filtrar-linhas-que-contem-string-dplyr\/\">Como filtrar linhas contendo uma determinada string usando dplyr<\/a><\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Quando usar grep()<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\"><strong>1. Selecione colunas que contenham uma determinada string<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">Voc\u00ea pode usar <strong>grep()<\/strong> para selecionar colunas em um quadro de dados contendo uma determinada string:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\">library(dplyr)<\/span>\n\n#create data frame<\/span>\ndf &lt;- data.frame(player = c('P Guard', 'S Guard', 'S Forward', 'P Forward', 'Center'),\n                 points = c(12, 15, 19, 22, 32),\n                 rebounds = c(5, 7, 7, 12, 11))\n\n<span style=\"color: #008080;\">#select columns that contain the string 'p' in their name\n<\/span><span style=\"color: #000000;\">df %&gt;% select( <span style=\"color: #3366ff;\">grep<\/span> ('p', colnames(df)))\n\n     player points\n1 P Guard 12\n2 S Guard 15\n3S Forward 19\n4P Forward 22\n5 Center 32<\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><strong>2. Conte o n\u00famero de linhas que cont\u00eam uma determinada string<\/strong><\/span><\/p>\n<p> <span style=\"color: #000000;\">Voc\u00ea pode usar <strong>grep()<\/strong> para contar o n\u00famero de linhas em um quadro de dados contendo uma determinada string:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame<\/span>\ndf &lt;- data.frame(player = c('P Guard', 'S Guard', 'S Forward', 'P Forward', 'Center'),\n                 points = c(12, 15, 19, 22, 32),\n                 rebounds = c(5, 7, 7, 12, 11))\n\n<span style=\"color: #008080;\">#count how many rows contain the string 'Guard' in the player column\n<\/span><span style=\"color: #000000;\">length( <span style=\"color: #3366ff;\">grep<\/span> ('Guard', df$player))\n\n[1] 2<\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\"><em>Voc\u00ea pode encontrar mais tutoriais de R <a href=\"https:\/\/statorials.org\/pt\/estatologia-explica-conceitos-de-forma-simples-e-direta-facilitamos-o-aprendizado-de-estatistica\/\" target=\"_blank\" rel=\"noopener noreferrer\">aqui<\/a> .<\/em><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Duas fun\u00e7\u00f5es que as pessoas costumam confundir em R s\u00e3o grep() e grepl() . Ambas as fun\u00e7\u00f5es permitem ver se existe um determinado padr\u00e3o em uma string, mas retornam resultados diferentes: grepl() retorna TRUE quando existe um padr\u00e3o em uma string. grep() retorna um vetor de \u00edndices de string contendo o padr\u00e3o. O exemplo a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-954","post","type-post","status-publish","format-standard","hentry","category-guia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Compara\u00e7\u00e3o de grep() e grepl() em R: qual a diferen\u00e7a?<\/title>\n<meta name=\"description\" content=\"Uma explica\u00e7\u00e3o simples da diferen\u00e7a entre as fun\u00e7\u00f5es grep() e grepl() em R.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/statorials.org\/pt\/grep-vs-grep-r\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Compara\u00e7\u00e3o de grep() e grepl() em R: qual a diferen\u00e7a?\" \/>\n<meta property=\"og:description\" content=\"Uma explica\u00e7\u00e3o simples da diferen\u00e7a entre as fun\u00e7\u00f5es grep() e grepl() em R.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/grep-vs-grep-r\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-28T04:57:15+00:00\" \/>\n<meta name=\"author\" content=\"Dr. benjamim anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dr. benjamim anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pt\/grep-vs-grep-r\/\",\"url\":\"https:\/\/statorials.org\/pt\/grep-vs-grep-r\/\",\"name\":\"Compara\u00e7\u00e3o de grep() e grepl() em R: qual a diferen\u00e7a?\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-28T04:57:15+00:00\",\"dateModified\":\"2023-07-28T04:57:15+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Uma explica\u00e7\u00e3o simples da diferen\u00e7a entre as fun\u00e7\u00f5es grep() e grepl() em R.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/grep-vs-grep-r\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/grep-vs-grep-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/grep-vs-grep-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Compara\u00e7\u00e3o de grep() e grepl() em r: qual a diferen\u00e7a?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/pt\/#website\",\"url\":\"https:\/\/statorials.org\/pt\/\",\"name\":\"Statorials\",\"description\":\"O seu guia para a literacia estat\u00edstica!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/pt\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pt-PT\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\",\"name\":\"Dr. benjamim anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"pt-PT\",\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Dr. benjamim anderson\"},\"description\":\"Ol\u00e1, sou Benjamin, um professor aposentado de estat\u00edstica que se tornou professor dedicado na Statorials. 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