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I have a Markdown file with image listings as follows.

![Some Text](static/images/image.png)

Using sed, I wish to convert it to the following format, but am not able to figure the correct pattern.

![](static/images/image.png){.my-class}

[Update]
A little more context. My Markdown files are like,

Hello
![Some Text](static/images/image.png)
World

I need to batch convert them to,

Hello
![](static/images/image.png){.my-class}
World

From other answers on Stackoverflow, I gathered that the pattern \[[^]]\] can be used to match square brackets. Using that, I could do the transformation i.e.

sed 's,^\!\[[^]]\+\]\(.*\)$,[]\1,g' file.md --> Works! Gives [](images/sl/2012-06-18.png)

But if I append {.my-class} towards the end, it messes it up.

sed 's,^\!\[[^]]\+\]\(.*\)$,[]\1\{.my-class\},g' file.md --> doesn't work! Gives {.my-class}(static/images/image.png)

So essentially, how can I use { in the replace pattern?

  • your last command works for me in GNU sed, even no need to escape { and }. – pLumo Oct 4 '18 at 14:47
  • Please expand on "messes up" and "doesn't work". What result do you get instead? Was there an error message? – JigglyNaga Oct 4 '18 at 15:18
2

You can try this sed command:

sed 's/\[[^]]\+\]/[]/;s/$/{.myclass}/' <<< '![Some Text](static/images/image.png)'
  • Thanks oliv. When run on a file, this didn't work e.g. sed <your_pattern> file.md. But works in the form you specified i.e. using a string input. Any idea why? – Mohnish Oct 3 '18 at 2:33
  • What isn't working exactly? – oliv Oct 3 '18 at 6:40
  • Executing it on a file is not working . When run on a file (as provided in my update), it doesn't perform replacement correctly. Try it on this file - gist.github.com/mohnish82/75f5e3b6e06ae6ce51c01c36bb096374 – Mohnish Oct 4 '18 at 12:09
  • works for me, but adds the class to any line, also this replaces every [...] which may not be what is expected. – pLumo Oct 4 '18 at 14:49
  • Figured the problem. The files containing CRLF line endings were producing incorrect output, while LF ones worked correctly. Applying converter pattern (s|^M$||g) fixes the issue. Thanks everyone. – Mohnish Oct 6 '18 at 1:51

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