Between Markers

Between Markers

Elementary+

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.

example

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

Output: A string.

Example: 

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

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