如何使用Xidel从具有@srcset属性的图像中提取所有@srcset宽度字符串？
[英]How to extract using Xidel all @srcset width strings from an image with @srcset attribute?
问题描述
Using Xidel , I need to extract all the image sizes in an @srcset attribute that contains a common pattern: " (\\d+)w " 
使用Xidel ，我需要提取@srcset属性中的所有图像大小，该属性包含一个通用模式：“ (\\d+)w “
./xidel "url_with_images" -e '?'
See this image example 查看此图片示例
<img ... @srcset="https://www.jewishpress.com/wp-content/uploads/Billionaire-Arnon-Milchan-and-PM-Benjamin-Netanyahu-696x457.jpg 696w, https://www.jewishpress.com/wp-content/uploads/Billionaire-Arnon-Milchan-and-PM-Benjamin-Netanyahu-220x144.jpg 220w, https://www.jewishpress.com/wp-content/uploads/Billionaire-Arnon-Milchan-and-PM-Benjamin-Netanyahu-300x197.jpg 300w, https://www.jewishpress.com/wp-content/uploads/Billionaire-Arnon-Milchan-and-PM-Benjamin-Netanyahu-768x504.jpg 768w, https://www.jewishpress.com/wp-content/uploads/Billionaire-Arnon-Milchan-and-PM-Benjamin-Netanyahu-475x312.jpg 475w, https://www.jewishpress.com/wp-content/uploads/Billionaire-Arnon-Milchan-and-PM-Benjamin-Netanyahu-741x486.jpg 741w, https://www.jewishpress.com/wp-content/uploads/Billionaire-Arnon-Milchan-and-PM-Benjamin-Netanyahu-640x420.jpg 640w, https://www.jewishpress.com/wp-content/uploads/Billionaire-Arnon-Milchan-and-PM-Benjamin-Netanyahu.jpg 800w" />
Xidel Output expected: Xidel输出预期：
696w
220w
300w
768w
475w
741w
650w
800w
1 个解决方案
解决方案1
2 已采纳 2019-03-17 18:04:31
http://www.benibela.de/documentation/internettools/xpath-functions.html#x-extract : http://www.benibela.de/documentation/internettools/xpath-functions.html#x-extract ：
If flags contains *, all occurrences are returned.
cat <<EOF | xidel -s - -e 'extract(//@srcset,"(\d+w)",1,"*")'
<img srcset="https://www.jewishpress.com/wp-content/uploads/Billionaire-Arnon-Milchan-and-PM-Benjamin-Netanyahu-696x457.jpg 696w, https://www.jewishpress.com/wp-content/uploads/Billionaire-Arnon-Milchan-and-PM-Benjamin-Netanyahu-220x144.jpg 220w, https://www.jewishpress.com/wp-content/uploads/Billionaire-Arnon-Milchan-and-PM-Benjamin-Netanyahu-300x197.jpg 300w, https://www.jewishpress.com/wp-content/uploads/Billionaire-Arnon-Milchan-and-PM-Benjamin-Netanyahu-768x504.jpg 768w, https://www.jewishpress.com/wp-content/uploads/Billionaire-Arnon-Milchan-and-PM-Benjamin-Netanyahu-475x312.jpg 475w, https://www.jewishpress.com/wp-content/uploads/Billionaire-Arnon-Milchan-and-PM-Benjamin-Netanyahu-741x486.jpg 741w, https://www.jewishpress.com/wp-content/uploads/Billionaire-Arnon-Milchan-and-PM-Benjamin-Netanyahu-640x420.jpg 640w, https://www.jewishpress.com/wp-content/uploads/Billionaire-Arnon-Milchan-and-PM-Benjamin-Netanyahu.jpg 800w" />
EOF
696w
220w
300w
768w
475w
741w
640w
800w
-e 'tokenize(//@srcset,",") ! substring-after(.,"jpg ")' -e 'tokenize(//@srcset,",") ! substring-after(.,"jpg ")' works too. -e 'tokenize(//@srcset,",") ! substring-after(.,"jpg ")'也可以。
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