CODEWITHSUNDEEP
javascriptregex
Ezio Shiki
Ezio Shiki

Reputation: 765

Multiline regex matching, issue in negated lookahead (CLOSED)

I have markdown like below:

# Heading!
* unorder list!
1. ordered list
*no it's not list
2.just normal text

``` 
block 
code 
python
```

#goodbye

And I want use regex to seperate it to 3 part, first and last is normal text, second is code block

Like this (some newlines is dropped by stackoverflow) :

First:

# Heading!
* unorder list!
1. ordered list
*no it's not list
2.just normal text

Code block:

```
block
code
python
```

Last:

#goodbye

I have used 

/^```(.|\n)+```$|^(.|\n)+(?!`)$/gm

in javascript but not working. Can't get the code block.

Anyone have ideas?

Upvotes: 1

Views: 55

Answers (3)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626802

You may use a regex to match 3 backticks at the start of the line and then any chars, as few as possible, up to the first line that starts with 3 backticks, and wrap the whole pattern with a capturing group to use in split so that the matched part also landed in the resulting array:

s.split(/^(`{3}[^]*?^`{3})/m)

The pattern matches:

  • ^ - start of a line
  • `{3} - 3 backticks
  • [^]*? - any 0+ chars, as few as possible
  • ^ - start of a line
  • `{3} - 3 backticks.

JS demo:

const regex = /^(`{3}[^]*?^`{3})/m;
const str = `# Heading!
* unorder list!
1. ordered list
*no it's not list
2.just normal text

\`\`\` 
block 
code 
python
\`\`\`

#goodbye`;
console.log(str.split(regex));

Upvotes: 1

Shudrum
Shudrum

Reputation: 176

With the option 'm' your regex is executed line by line. You'll need to test with one quest and manage the line breaks.

Like it: (?:\s|\S)([\s\S]+.*)

See: https://regex101.com/r/Re23vd/1

Upvotes: 0

Toto
Toto

Reputation: 91385

Why not split on ``` ?

var str = `# Heading!
* unorder list!
1. ordered list
*no it's not list
2.just normal text

\`\`\` 
block 
code 
python
\`\`\`

#goodbye`;

out = str.split('```');
console.log(out);

Upvotes: 0

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