正则表达式解析 XML - RSS 提要

Question

<atom:link rel="self" href="http://www.independent.co.uk/"/>
<item>
<title>
Coronavirus: Why the Covid-19 economic stimulus deal will make it to Trump&apos;s desk
</title>
<link>
https://www.independent.co.uk/news/world/americas/us-politics/coronavirus-economic-stimulus-deal-covid-19-trump-bill-senate-house-a9419976.html
</link>
<description>
<![CDATA[
News Analysis: When Senate tries to pass major bills, there's always one day of chaos. Monday appears to be that day.
]]>
</description>

For the content above i would like to extract the title, link and description How can I formulate my regex rule to capture this?

The end goal being to dump the extracted content to a predefined sql db that i created

Answer 1

As suggested in comments most likely you should be using an XML parser and not regex, but as the format of the RSS feed is probably consistent and quite simple a regex solution might work too.

For the current example you can use:

<(.+)>\s*(?:<!\[CDATA\[)?\s*(.*)\s*(?:]]>)?\s*<\/\1>

Explanation:

• <(.+)> - matches opening tag, captures the name
• \\s* - matches optional whitespace characters (new line in your example)
• (?:<!\\[CDATA\\[)? - non-capturing group for <![CDATA[ , matched 0 or 1 times
• \\s* - matches optional whitespace characters
• (.*) - capturing group that will catch any characters
• \\s* - matches optional whitespace characters
• (?:]]>)? - non-capturing group for ]]> (CDATA closing), matched 0 or 1 times
• \\s* - matches optional whitespace characters
• <\\/\\1> - matches closing tag with same name as opening tag (backreference to 1st capture group)

 let input = `<title> Coronavirus: Why the Covid-19 economic stimulus deal will make it to Trump&apos;s desk </title> <link> https://www.independent.co.uk/news/world/americas/us-politics/coronavirus-economic-stimulus-deal-covid-19-trump-bill-senate-house-a9419976.html </link> <description> <![CDATA[ News Analysis: When Senate tries to pass major bills, there's always one day of chaos. Monday appears to be that day. ]]> </description>`; let regex = /<(.+)>\\s*(?:<!\\[CDATA\\[)?\\s*(.*)\\s*(?:]]>)?\\s*<\\/\\1>/g; let result; do { result = regex.exec(input); if (result) { console.log(result[1] + ": " + result[2]); } } while (result);