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Visualizaçõesregex to find more than one occurence of comment within a block
I have some markdown files in which I follow a certain Q & A format to sync my flashcards from my note-taking software Obsidian to Anki. Somehow, there seems to be messup where there were duplicate questions created in Anki due to newline characters. I want to find these duplicates and delete them out from my note and remove the redundant newline characters which caused these duplicates questions to happen. Here is a sample data file:
### Alias
Q: what check to do before creating an alias?
A: check whether any other command exists by that name using `type new-alias-name`
<!--ID: 1643091253375-->
---
Q: syntax to create an alias?
A: `alias name='string'`
<!--ID: 1645446702965-->
- no spaces before or after the equal sign
- single quotes around the command sequence
![[Pasted image 20220125092954.png]]
<!--ID: 1643091253408-->
---
### Redirection/Piping
Q: output of `> ls-output.txt`
A: the file will be truncated if it exists or it would be created.
<!--ID: 1645087988730-->
- Simply using the redirection operator with no command preceding it will truncate an existing file or create a new empty file
<!--ID: 1643351731943-->
---
Each comment which has a format like <!--ID: 1645446702965--> is a flashcard in Anki. In the 2nd question to create an alias, you can see that there are 2 IDs. I want to delete the first one and remove the newlines after that so that there is only one ID comment that remains.
Here is the regex I am trying -
^A:.+?(<!--ID:\s\d+-->)(?!---).+(<!--ID:\s\d+-->)
Here I am trying to match the Answer sections where the ID comments occur twice. I am using a negative lookahead to allow anything other than ---. But the highlight shows that the regex is reaching too far. I am quite new to Regex and just finished one round of reading 'Mastering Regular expressions by Jeffrey Friedl'. I am still trying to wrap my head around greedy and lazy behaviour. Any guidance to help me move forward on this would be appreciated.
I have my regex with the data posted here in case anyone want to try: https://regex101.com/r/jBSc8Y/1
1 Respostas
Responde à pergunta0
Beside the versions already linked with the comments, the most practical solution might be to use a string replacement with a simple regex like /<!--\s*ID:\s*\d+\s*-->\n+-\s+/g ... where one would match ...
<!--\s*ID:\s*\d+\s*-->... the exactIDformat\n+-\s+... followed by at least one new line, a hyphen, and a whitespace(-sequence).
The last bullet-point also describes what makes an ID format a duplicate.
Then one just needs to replace the match by - .
const sampleText = `
### Alias
Q: what check to do before creating an alias?
A: check whether any other command exists by that name using \`type new-alias-name\`
<!--ID: 1643091253375-->
---
Q: syntax to create an alias?
A: \`alias name='string'\`
<!--ID: 1645446702965-->
- no spaces before or after the equal sign
- single quotes around the command sequence
![[Pasted image 20220125092954.png]]
<!--ID: 1643091253408-->
---
### Redirection/Piping
Q: output of \`> ls-output.txt\`
A: the file will be truncated if it exists or it would be created.
<!--ID: 1645087988730-->
- Simply using the redirection operator with no command preceding it will truncate an existing file or create a new empty file
<!--ID: 1643351731943-->
`;
const regXDuplicateId = /<!--\s*ID:\s*\d+\s*-->\n+-\s+/g;
console.log(
sampleText.replace(regXDuplicateId, '- ')
);.as-console-wrapper { min-height: 100%!important; top: 0; }