CODEWITHSUNDEEP
rubyregex
kklw
kklw

Reputation: 898

Split markdown by each section using ruby regex

I have this markdown as string:

# section 1\n\n
any type of valid markdown text. /notations here\n 
Sample text for testing:
abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ
0123456789 _+-.,!@$%^&*();\/|<>"'
12345 -98.7 3.141 .6180 9,000 +42
555.123.4567    +1-(800)-555-2468
[email protected]    [email protected]
www.demo.com    http://foo.co.uk/
http://regexr.com/foo.html?q=bar
https://mediatemple.net
- list 1
- list 2
[www.asdf.com](some description)

## sec 1.1\n blah\n
# header 2\n\n
## 2.1\n\n
### 2.2\n
# some_section\n
## 3.1\n\n

I would like to split the string by section, eg the output should be a list of 3 entries of string. The first entry should be '# section 1\n\n ## 1.1\n blah\n'.

The regex i'm using is /[^#]# [\s\S]+?(?=#)/ . How do I match a string without ' #' at the end? And my regex is matching the whole string instead of the output i need.

Sample at http://regexr.com/3ev83 . Thanks.

Upvotes: 0

Views: 512

Answers (2)

Eric Duminil
Eric Duminil

Reputation: 54293

You can use slice_before instead of a big regex :

markup = "# section 1\n\n
## 1.1\n
blah\n
# section 2\n\n
## 2.1\n\n
### 2.2\n
# section 3\n
## 3.1\n\n "

p markup.each_line.slice_before(/# section \d+/).map(&:join)
#=> ["# section 2\n\n\n## 1.1\n\nblah\n\n", "# section 2\n\n\n## 2.1\n\n\n### 2.2\n\n", "# section 3\n\n## 3.1\n\n "]

If you want to generalise the method for any header, you can just use :

p markup.each_line.slice_before(/^# /).map(&:join)

If you want to iterate over every line in each section, you can remove join :

markup.each_line.slice_before(/^# /).each do |section|
  section.each do |line|
    # do something with line
  end
end

Upvotes: 1

akuhn
akuhn

Reputation: 27803

Try this,

string.split(/(?=^# )/)

And if you want to split at any heading from # through ###

string.split(/(?=^#+ )/)

How does this work?

  • ^ matches the begin of the line
  • (?=...) is a lookahead match
  • No need to match line endings

Upvotes: 2

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