Question

我搜索了Grep和RegEx选择器的多个来源，以选择大量乱码和文本集合中的所有图像。我最接近的是How to Use grep to find '../images/'，这对我不起作用。

我需要在源文件中选择所有图像名称的第一次出现（或将所有图像名称复制到单独的文件中），例如：

/Volumes/Data Drive/joomla-2-wp/wp-content/uploads/2003/12/someurl.com_images_ABanner.gif

只会选择

someurl.com_images_ABanner.gif

以下是我试图搜索的文字示例：

[fg-joomla-to-wordpress] Can't copy http://someurl.com/images/banners/ABanner.gif to /Volumes/Data Drive/joomla-2-wp/wp-content/uploads/2003/12/someurl.com_images_banners_ABanner.gif : Not Found
[fg-joomla-to-wordpress] Can't copy http://someurl.com/images/randy.jpg to /Volumes/Data Drive/joomla-2-wp/wp-content/uploads/2003/12/someurl.com_images_randy.jpg : Not Found
[fg-joomla-to-wordpress] Can't copy http://www.differenturl.com/images-body0/logo2.gif to /Volumes/Data Drive/joomla-2-wp/wp-content/uploads/2003/12/www.differenturl.com_images-body0_logo2.gif : Not Found
[fg-joomla-to-wordpress] Can't copy /images/DiffImage.jpg to /Volumes/Data Drive/joomla-2-wp/wp-content/uploads/2003/12/images_DiffImage.jpg : A valid URL was not provided.
[fg-joomla-to-wordpress] Can't copy /images/DSCN0248.jpg to /Volumes/Data Drive/joomla-2-wp/wp-content/uploads/2003/12/images_DSCN0248.jpg : A valid URL was not provided.

我认识到第一次出现的模式包含/ images /有一些例外（例如/images-body0/imagename.jpg），而目标没有，这简化了它，但我无法得到它。

Answer 1

使用awk

如果我理解正确，您在示例文本中寻找的是第四个字段的最后路径元素。在那种情况下：

$ awk '{n=split($4,a,"/"); print a[n]}' file
ABanner.gif
randy.jpg
logo2.gif
DiffImage.jpg
DSCN0248.jpg

使用sed

获取copy和to之间存在的文件名的最后一个元素：

$ sed -E 's|.* copy .*/(.*) to .*|\1|' file
ABanner.gif
randy.jpg
logo2.gif
DiffImage.jpg
DSCN0248.jpg

Answer 2

如何使用sed的扩展（-E）正则表达式？我选择在输入行的最后:之前发生的所有图像（jpg，gif，png）。

$ sed -nE 's,^.*/([^/]*(jpg|gif|png)) : .*$,\1,p' file
someurl.com_images_banners_ABanner.gif
someurl.com_images_randy.jpg
www.differenturl.com_images-body0_logo2.gif
images_DiffImage.jpg
images_DSCN0248.jpg

Answer 3

如果文件中的所有行都具有与样本中相同的模式，则可以像这样简单地提取每行的第7个字段：

$ cat file
[fg-joomla-to-wordpress] Can't copy http://someurl.com/images/banners/ABanner.gif to /Volumes/Data Drive/joomla-2-wp/wp-content/uploads/2003/12/someurl.com_images_banners_ABanner.gif : Not Found
[fg-joomla-to-wordpress] Can't copy http://someurl.com/images/randy.jpg to /Volumes/Data Drive/joomla-2-wp/wp-content/uploads/2003/12/someurl.com_images_randy.jpg : Not Found
[fg-joomla-to-wordpress] Can't copy http://www.differenturl.com/images-body0/logo2.gif to /Volumes/Data Drive/joomla-2-wp/wp-content/uploads/2003/12/www.differenturl.com_images-body0_logo2.gif : Not Found
[fg-joomla-to-wordpress] Can't copy /images/DiffImage.jpg to /Volumes/Data Drive/joomla-2-wp/wp-content/uploads/2003/12/images_DiffImage.jpg : A valid URL was not provided.
[fg-joomla-to-wordpress] Can't copy /images/DSCN0248.jpg to /Volumes/Data Drive/joomla-2-wp/wp-content/uploads/2003/12/images_DSCN0248.jpg : A valid URL was not provided.

$ cut -d' ' -f7 file | sed '/images/ s#.*/\([^/]*\)#\1#'
someurl.com_images_banners_ABanner.gif
someurl.com_images_randy.jpg
www.differenturl.com_images-body0_logo2.gif
images_DiffImage.jpg
images_DSCN0248.jpg

Grep选择代码块中的所有图像

3 个答案:

使用awk

使用sed