Between Markers

Between Markers


You are given a string and two markers (the initial and final). You have to find a substring enclosed between these two markers. But there are a few important conditions:

  • The initial and final markers are always different.
  • If there is no initial marker, then the first character should be considered the beginning of a string.
  • If there is no final marker, then the last character should be considered the ending of a string.
  • If the initial and final markers are missing then simply return the whole string.
  • If the final marker comes before the initial marker, then return an empty string.


Input: Three arguments. All of them are strings. The second and third arguments are the initial and final markers.

Output: A string.


assert between_markers("What is >apple<", ">", "<") == "apple"
assert (
    between_markers("<head><title>My new site</title></head>", "<title>", "</title>")
    == "My new site"
assert between_markers("No[/b] hi", "[b]", "[/b]") == "No"
assert between_markers("No [b]hi", "[b]", "[/b]") == "hi"

How it is used: for parsing texts

Precondition: can't be more than one final marker and can't be more than one initial. Marker can't be an empty string

Invalid hot key. Each hot key should be unique and valid
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CheckiO Extensions

CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.

In order to install CheckiO client you'll need installed Python (version at least 3.8)

Install CheckiO Client first:

pip3 install checkio_client

Configure your tool

checkio --domain=py config --key=

Sync solutions into your local folder

checkio sync

(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)

checkio serv -d

Alternatevly, you can install Chrome extension or FF addon

checkio install-plugin
checkio install-plugin --ff
checkio install-plugin --chromium

Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.

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