{"id":7611,"date":"2016-01-22T17:40:24","date_gmt":"2016-01-22T17:40:24","guid":{"rendered":"https:\/\/dev.railscarma.com\/learning-the-fundamentals-of-nokogiri-gem\/"},"modified":"2022-08-30T09:02:48","modified_gmt":"2022-08-30T09:02:48","slug":"%e3%83%8e%e3%82%b3%e3%82%ae%e3%83%aa%e3%82%b8%e3%82%a7%e3%83%a0%e3%81%ae%e5%9f%ba%e6%9c%ac%e3%82%92%e5%ad%a6%e3%81%b6","status":"publish","type":"post","link":"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/%e6%8a%80%e8%a1%93%e8%ab%96%e6%96%87\/%e3%83%8e%e3%82%b3%e3%82%ae%e3%83%aa%e3%82%b8%e3%82%a7%e3%83%a0%e3%81%ae%e5%9f%ba%e6%9c%ac%e3%82%92%e5%ad%a6%e3%81%b6\/","title":{"rendered":"\u92f8\u5b9d\u77f3\u306e\u57fa\u790e\u3092\u5b66\u3076"},"content":{"rendered":"
\n\t\t\t\t\t\t
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<\/p>\n

\u4e16\u754c\u306f\u307e\u3059\u307e\u3059\u901f\u304f\u56de\u8ee2\u3057\u3066\u304a\u308a\u3001\u3053\u306e\u52a0\u901f\u306f\u79c1\u305f\u3061\u306e\u751f\u6d3b\u306e\u3042\u3089\u3086\u308b\u9762\u3067\u9855\u8457\u3067\u3042\u308b\u3002\u7279\u306b\u30d3\u30b8\u30cd\u30b9\u306b\u95a2\u3057\u3066\u306f\u3001\u305d\u306e\u30b9\u30d4\u30fc\u30c9\u304c\u91cd\u8981\u8996\u3055\u308c\u3066\u3044\u308b\u3002\u3053\u306e\u72c2\u304a\u3057\u3044\u307b\u3069\u306e\u52a0\u901f\u306e\u4e2d\u3067\u3001\u4e0d\u5909\u306a\u306e\u306f\u5909\u52d5\u6027\u3060\u3051\u3067\u3042\u308b\u3002\u3053\u306e\u30da\u30fc\u30b9\u306b\u8ffd\u3044\u3064\u304d\u3001\u307e\u3059\u307e\u3059\u6fc0\u5316\u3059\u308b\u7af6\u4e89\u306b\u6253\u3061\u52dd\u3064\u305f\u3081\u306b\u3001\u4f01\u696d\u306f\u52b9\u7387\u3092\u9ad8\u3081\u3001\u5e02\u5834\u6295\u5165\u307e\u3067\u306e\u30b9\u30d4\u30fc\u30c9\u3092\u4e0a\u3052\u308b\u65b9\u6cd5\u3092\u6a21\u7d22\u3057\u3066\u3044\u308b\u3002\u3053\u306e\u3053\u3068\u304c\u3001Ruby on Rails\u306e\u3088\u3046\u306a\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306e\u4eba\u6c17\u306e\u80cc\u5f8c\u306b\u3042\u308b\u71b1\u72c2\u3092\u8aac\u660e\u3057\u3066\u3044\u308b\u3002Ruby on Rails\u304c\u3055\u3089\u306b\u7d20\u6674\u3089\u3057\u3044\u306e\u306f\u3001\u642d\u8f09\u3055\u308c\u3066\u3044\u308b\u5b9d\u77f3\u306e\u6570\u306e\u591a\u3055\u3060\u3002\u3042\u308b\u30c4\u30fc\u30eb\u3092\u60f3\u50cf\u3059\u308c\u3070\u3001\u304a\u305d\u3089\u304f\u3042\u306a\u305f\u306eRuby\u30ad\u30c3\u30c8\u306e\u4e2d\u306b\u3042\u308b\u306f\u305a\u3060\u3002Ruby on Rails\u306b\u6700\u9069\u306agem\u306e1\u3064\u304cNokogiri\u3067\u3001XML\u3068HTML\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u6271\u3046\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u3059\u3002Nokogiri\u306e\u3088\u3046\u306a\u30d1\u30fc\u30b5\u30fc\u306e\u6700\u3082\u4e00\u822c\u7684\u306a\u7528\u9014\u306f\u3001\u69cb\u9020\u5316\u3055\u308c\u305f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u304b\u3089\u30c7\u30fc\u30bf\u3092\u62bd\u51fa\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u4f8b\u3048\u3070<\/p>\n

    \n
  • \u4fa1\u683c\u6bd4\u8f03\u30b5\u30a4\u30c8\u306e\u4fa1\u683c\u30ea\u30b9\u30c8\u3002<\/li>\n
  • \u691c\u7d22\u30a8\u30f3\u30b8\u30f3\u304b\u3089\u306e\u691c\u7d22\u7d50\u679c\u30ea\u30f3\u30af\u3002<\/li>\n
  • Q&A\u30b5\u30a4\u30c8\u306e\u56de\u7b54\u4e00\u89a7\u3002<\/li>\n<\/ul>\n

    \u30a4\u30f3\u30b9\u30c8\u30fc\u30eb:<\/strong><\/p>\n

    OS X\uff1a<\/strong><\/p>\n

    macports\u304b\u3089libxml2\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\uff1a<\/p>\n

    \n

    $ sudo port install libxml2 libxslt<\/p>\n<\/blockquote>\n

    \u305d\u3057\u3066\u3001\u30ce\u30b3\u30ae\u30ea\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\uff1a<\/p>\n

    \n

    $ sudo gem install nokogiri<\/p>\n<\/blockquote>\n

    Linux\u3060\uff1a<\/strong><\/p>\n

    Linux\u3067\u306f\u3001libxml2\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002libxml2\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u30b3\u30de\u30f3\u30c9\u306f\u3001\u4f7f\u7528\u3057\u3066\u3044\u308b\u30d1\u30c3\u30b1\u30fc\u30b8\u30fb\u30de\u30cd\u30fc\u30b8\u30e3\u30fc\u3068Linux\u30c7\u30a3\u30b9\u30c8\u30ea\u30d3\u30e5\u30fc\u30b7\u30e7\u30f3\u306b\u3088\u3063\u3066\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n

    Fedora\u3067\uff1a<\/strong><\/p>\n

    \n

    $ sudo yum install libxml2-devel libxslt-devel<\/p>\n

    $ gem install nokogiri<\/p>\n<\/blockquote>\n

    Ubuntu\u3067\uff1a<\/strong><\/p>\n

    \n

    $ sudopt-get install libxml2 libxml2-dev libxslt libxslt-dev<\/p>\n

    $ gem install nokogiri<\/p>\n<\/blockquote>\n

    \u30ce\u30b3\u30ae\u30ea\u3092\u59cb\u3081\u3088\u3046<\/strong><\/p>\n

    Nokogiri\u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u305f\u3089\u3001\u65e9\u901f\u4f7f\u3063\u3066\u307f\u3088\u3046\u3002Nokogiri\u306fXPath\u307e\u305f\u306fCSS3\u30bb\u30ec\u30af\u30bf\u3092\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002CSS\u30bb\u30ec\u30af\u30bf\u304c\u4f7f\u3048\u308b\u306e\u3067\u3001HTML\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u304b\u3089\u30c7\u30fc\u30bf\u3092\u62bd\u51fa\u3059\u308b\u306e\u306b\u3068\u3066\u3082\u9069\u3057\u3066\u3044\u308b\u3002<\/p>\n

    \n

    \u300crubygems\u300d\u304c\u5fc5\u8981\u3067\u3059<\/p>\n

    require 'nokogiri'<\/p>\n

    require 'open-uri'<\/p>\n<\/blockquote>\n

    nokogiri gem\u3060\u3051\u3067\u306a\u304f\u3001open-uri\u3082\u5fc5\u8981\u306a\u306e\u3067\u3001URL\u306e\u5185\u5bb9\u3092\u7c21\u5358\u306b\u898b\u3064\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u6b21\u306b\u3001\u65b0\u3057\u3044Nokogiri HTML\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u4f5c\u6210\u3057\u3001\u691c\u7d22\u7d50\u679c\u30da\u30fc\u30b8\u306e\u5185\u5bb9\u3092\u6e21\u3057\u307e\u3059\u3002at_css\u3067CSS\u30bb\u30ec\u30af\u30bf \"title \"\u3092\u6e21\u3059\u3068\u3001\u8981\u7d20\u306e\u5185\u5bb9\u3092\u53d6\u5f97\u3067\u304d\u308b\u3002at_css\u30e1\u30bd\u30c3\u30c9\u306f\u6700\u521d\u306b\u30de\u30c3\u30c1\u3057\u305f\u8981\u7d20\u3092\u8fd4\u3059\u306e\u3067\u3001\u305d\u306e\u8981\u7d20\u306b\u5bfe\u3057\u3066.text\u3092\u547c\u3073\u51fa\u3057\u3066\u30c6\u30ad\u30b9\u30c8\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u6700\u5f8c\u306b\u3001puts\u3092\u4f7f\u3063\u3066\u30c6\u30ad\u30b9\u30c8\u3092\u51fa\u529b\u3059\u308b\u3002<\/p>\n<p><strong>\u57fa\u672c\u7684\u306a\u69cb\u6587\u89e3\u6790\uff1a<\/strong><\/p>\n<p>Nokogiri\u3067\u306f\u3001HTML\u3084XML\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u3044\u304f\u3064\u304b\u306e\u7570\u306a\u308b\u65b9\u6cd5\u3067\u89e3\u6790\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n<ul>\n<li>DOM<\/li>\n<li>\u30b5\u30c3\u30af\u30b9<\/li>\n<li>\u30ea\u30fc\u30c0\u30fc<\/li>\n<li>\u30d7\u30eb<\/li>\n<\/ul>\n<p>\u3053\u308c\u3089\u306e\u6226\u7565\u306b\u306f\u305d\u308c\u305e\u308c\u7570\u306a\u308b\u9577\u6240\u3068\u77ed\u6240\u304c\u3042\u308b\u3002DOM\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30a4\u30b9\u306f\u6700\u3082\u4e00\u822c\u7684\u3067\u3001\u4e00\u822c\u7684\u306b\u6700\u3082\u4f7f\u3044\u3084\u3059\u3044\u3068\u3055\u308c\u3066\u3044\u308b\u3002<\/p>\n<p>\u5217\u306e\u6700\u5f8c\u306e\u5546\u54c1\u3067\u3042\u308b\u3059\u3079\u3066\u306e\u5546\u54c1\u306f\u3001\u7570\u306a\u308b\u30af\u30e9\u30b9\u3092\u6301\u3063\u3066\u3044\u308b\uff1a<\/p>\n<blockquote>\n<p><div class="”product" lastcol”><br><a href="\/ja\/”\/product\/f05f\/”\/" class="”product_link”"><br><img<br>src=\"\/images\/dot_clear.gif\"<br>title=\"\u518d\u5229\u7528\u53ef\u80fd\u306a\u6563\u5f3e\u9283\u306e\u85ac\u83a2\u30dc\u30c8\u30eb\u306b\u5165\u3063\u305f\u3001\u3053\u306e\u5f37\u529b\u306a\u30a8\u30cd\u30eb\u30ae\u30fc\u30fb\u30b7\u30e7\u30c3\u30c8\u3067\u7720\u308a\u3092\u7834\u58ca\u305b\u3088\"<br>alt=\"Zombie Blast Energy Shots 3\u30d1\u30c3\u30af\"<br>\u5e45=\"125<br>\u9ad8\u3055=\"125<br>class=\"lazy\"<br>data-original=\"http:\/\/a.tgcdn.net\/images\/products\/thumb\/largesquare\/f05f_zombie_blast_energy_shots.jpg\"<br>\/><br><h4>\u30be\u30f3\u30d3\u30fb\u30d6\u30e9\u30b9\u30c8\u30fb\u30a8\u30ca\u30b8\u30fc\u30fb\u30b7\u30e7\u30c3\u30c8 3\u30d1\u30c3\u30af<\/h4><br><\/a><br><p>$9.99<\/p><br><\/div><\/p>\n<\/blockquote>\n<p>\u3064\u307e\u308a\u3001\u5546\u54c1\u540d\u3092\u77e5\u308b\u305f\u3081\u306b\u306f\u3053\u3046\u8a00\u3046\u306e\u3060\uff1a<\/p>\n<p><strong>\u82f1\u8a9e\u3060\uff1a <\/strong>\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306e\u30eb\u30fc\u30c8\u304b\u3089\u59cb\u3081\u308b\uff1a\u300cproduct\u300d\u3068\u3044\u3046\u5358\u8a9e\u3092\u542b\u3080\u30af\u30e9\u30b9\u540d\u3092\u6301\u3064\u3059\u3079\u3066\u306ediv\u3092\u63a2\u3059\u3002\u305d\u306e\u4e2d\u306b\u30ea\u30f3\u30af\u3092\u898b\u3064\u3051\u308b\u3002\u305d\u306e\u30ea\u30f3\u30af\u306e\u4e2d\u3067h4\u30c6\u30ad\u30b9\u30c8\u3092\u898b\u3064\u3051\u308b\u3002<\/p>\n<p><strong>XPath\uff1a<\/strong> \/\/div[contains(@class,'product')]\/a\/h4<\/p>\n<p>XPath \u306e\u7b49\u53f7\u6f14\u7b97\u5b50\u306f\u3001\u5b8c\u5168\u306a\u5024 (\u3053\u306e\u5834\u5408\u306f\u6587\u5b57\u5217) \u306b\u306e\u307f\u30de\u30c3\u30c1\u3057\u307e\u3059\u3002XPath \u306f\u30af\u30e9\u30b9\u540d\u5168\u4f53\u306b\u3057\u304b\u30de\u30c3\u30c1\u3057\u306a\u3044\u306e\u3067\u3001Xpath \u3067 div[@class='product'] \u3092\u6307\u5b9a\u3057\u3066\u3082\u3001\u6700\u5f8c\u306e\u30ab\u30e9\u30e0\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p><strong>\u53c2\u7167\uff1a<\/strong><\/p>\n<p><a href=\"https:\/\/github.com\/sparklemotion\/nokogiri\" target=\"_blank\">https:\/\/github.com\/sparklemotion\/nokogiri<\/a><br><\/p>\n<p><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-7fc30299 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"7fc30299\" data-element_type=\"section\" data-settings=\"{"background_background":"classic"}\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-51885040\" data-id=\"51885040\" data-element_type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-6ea8ff86 elementor-widget elementor-widget-heading\" data-id=\"6ea8ff86\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">\u6700\u65b0\u306e\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\u3092\u8cfc\u8aad\u3059\u308b<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5ba6176f elementor-widget elementor-widget-shortcode\" data-id=\"5ba6176f\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\">\t\t\t\t\t<script type=\"text\/javascript\">\n\t\t\t\t\t\tvar gCaptchaSibWidget;\n var onloadSibCallbackInvisible = function () {\n\n var element = document.getElementsByClassName('sib-default-btn');\n var countInvisible = 0;\n var indexArray = [];\n jQuery('.sib-default-btn').each(function (index, el) {\n if ((jQuery(el).attr('id') == \"invisible\")) {\n indexArray[countInvisible] = index;\n countInvisible++\n }\n });\n\n jQuery('.invi-recaptcha').each(function (index, el) {\n grecaptcha.render(element[indexArray[index]], {\n 'sitekey': jQuery(el).attr('data-sitekey'),\n 'callback': sibVerifyCallback,\n });\n });\n };\n\t\t\t\t\t<\/script>\n\t\t\t\t\t <script src=\"https:\/\/www.google.com\/recaptcha\/api.js?onload=onloadSibCallbackInvisible&render=explicit\" async defer><\/script>\n\t\t\t\t\n\t\t\t<form id=\"sib_signup_form_1\" method=\"post\" class=\"sib_signup_form\" action=\"\">\n\t\t\t\t<div class=\"sib_loader\" style=\"display:none;\"><img\n\t\t\t\t\t\t\tsrc=\"https:\/\/www.railscarma.com\/wp-includes\/images\/spinner.gif\" alt=\"\u30ed\u30fc\u30c0\"><\/div>\n\t\t\t\t<input type=\"hidden\" name=\"sib_form_action\" value=\"subscribe_form_submit\">\n\t\t\t\t<input type=\"hidden\" name=\"sib_form_id\" value=\"1\">\n <input type=\"hidden\" name=\"sib_form_alert_notice\" value=\"Please fill out this field\">\n <input type=\"hidden\" name=\"sib_form_invalid_email_notice\" value=\"Your email address is invalid\">\n <input type=\"hidden\" name=\"sib_security\" value=\"d7f7626ab9\">\n\t\t\t\t<div class=\"sib_signup_box_inside_1\">\n\t\t\t\t\t<div style=\"\/*display:none*\/\" class=\"sib_msg_disp\">\n\t\t\t\t\t<\/div>\n <div id=\"sib_captcha_invisible\" class=\"invi-recaptcha\" data-sitekey=\"6LdikOAaAAAAAJ6SWrrKVQrtw7TQpQAEnv0HS0G3\"><\/div>\n \t\t\t\t\t<p class=\"sib-email-area\">\r\n <label class=\"sib-email-area\"><\/label>\r\n <input type=\"email\" class=\"sib-email-area\" name=\"email\" required=\"required\" placeholder=\"\u96fb\u5b50\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\">\r\n<\/p>\r\n<p class=\"sib-NAME-area\">\r\n <label class=\"sib-NAME-area\"><\/label>\r\n <input type=\"text\" class=\"sib-NAME-area\" name=\"NAME\" placeholder=\"\u540d\u524d\">\r\n<\/p>\r\n<p>\r\n <input type=\"submit\" id=\"invisible\" class=\"sib-default-btn\" value=\"\u8cfc\u8aad\u3059\u308b\">\r\n<\/p>\t\t\t\t<\/div>\n\t\t\t<input type=\"hidden\" name=\"trp-form-language\" value=\"ja\"\/><\/form>\n\t\t\t<style>\n\t\t\t\tform#sib_signup_form_1 p.sib-alert-message {\n padding: 6px 12px;\n margin-bottom: 20px;\n border: 1px solid transparent;\n border-radius: 4px;\n -webkit-box-sizing: border-box;\n -moz-box-sizing: border-box;\n box-sizing: border-box;\n}\nform#sib_signup_form_1 p.sib-alert-message-error {\n background-color: #f2dede;\n border-color: #ebccd1;\n color: #a94442;\n}\nform#sib_signup_form_1 p.sib-alert-message-success {\n background-color: #dff0d8;\n 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on Rails \u306e\u3088\u3046\u306a\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u306e\u4eba\u6c17\u306e\u80cc\u5f8c\u306b\u3042\u308b\u71b1\u72c2\u3092\u8aac\u660e\u3057\u3066\u3044\u307e\u3059\u3002 Ruby on Rails \u3092\u3055\u3089\u306b\u7d20\u6674\u3089\u3057\u3044\u3082\u306e\u306b\u3057\u3066\u3044\u308b\u306e\u306f\u3001\u81a8\u5927\u306a\u6570\u306e\u5b9d\u77f3\u304c\u8a70\u3081\u8fbc\u307e\u308c\u3066\u3044\u308b\u3053\u3068\u3067\u3059\u3002\u3042\u308b\u30c4\u30fc\u30eb\u3092\u60f3\u50cf\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\u304a\u305d\u3089\u304f\u305d\u308c\u306f\u6b21\u306e\u5834\u6240\u306b\u3042\u308b\u306f\u305a\u3067\u3059\u3002<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/ruby-regex-match-guide-with-examples\/\"> <span class=\"screen-reader-text\">Ruby\u6b63\u898f\u8868\u73fe\u30de\u30c3\u30c1\u30ac\u30a4\u30c9\uff082026\uff09\u4f8b\u4ed8\u304d<\/span> 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