Question

我想使用rails（erb.html文件）搜索并替换任何出现的{phrase}和<a href="/phrase">phrase</a>。需要替换多个短语，并且事先不知道这些短语。

完整示例：

Hi {guys}, I really like {ruby on rails}

需要成为

Hi <a href="/guys">guys</a>, <a href="/ruby on rails">ruby on rails</a>

这适用于用户生成的内容网站（GMT）

Answer 1

这是简单的正则表达式，只需使用

your_string.gsub(/{(.*?)}/, '<a href="\\1">\\1</a>')

示例：

"{aaa} is not {bbb} you know".gsub(/{(.*?)}/, '<a href="/\\1">\\1</a>')

将产生

<a href="/aaa">aaa</a> is not <a href="/bbb">bbb</a> you know

Answer 2

您可以使用gsub

执行此操作

irb(main):001:0> str = " I have written this phrase statement, I want to replace occurences of all phrase with other statement"
=> " I have written this phrase statement, I want to replace occurences of all phrase with other statement"
irb(main):002:0> str.gsub("phrase",'<a href="/phrase">phrase</a>')
=> " I have written this <a href=\"/phrase\">phrase</a> statement, I want to replace occurences of all <a href=\"/phrase\">phrase</a> with other statement"

Answer 3

更好的方法是使用Markdown输出引擎（Redcarpet是最强大的引擎之一）

您必须创建custom renderer：

#lib/custom_renderer.rb
class AutoLinks < Redcarpet::Render::HTML
  def auto_link(phrase) #-> will need to search through content. Can research further
    link_to phrase, "/#{phrase}"
  end
end

#controller
markdown = Redcarpet::Markdown.new(AutoLinks, auto_link: "ruby on rails")

Answer 4

只需在你的erb中使用帮助器。例如：

<强> tag_helper.rb：

module TagHelper
  def atag(phrase)
    "<a href='/#{phrase}'>#{phrase}</a>"
  end
end

<强> some.html.erb：

<%= atag('guys')%>

在rails中用<a href="/phrase">phrase</a>替换{phrase}

4 个答案: