How to resolve the algorithm Multisplit step by step in the Julia programming language

Published on 22 June 2024 08:30 PM
#Julia

How to resolve the algorithm Multisplit step by step in the Julia programming language

Table of Contents

Problem Statement

It is often necessary to split a string into pieces based on several different (potentially multi-character) separator strings, while still retaining the information about which separators were present in the input. This is particularly useful when doing small parsing tasks. The task is to write code to demonstrate this. The function (or procedure or method, as appropriate) should take an input string and an ordered collection of separators. The order of the separators is significant: The delimiter order represents priority in matching, with the first defined delimiter having the highest priority. In cases where there would be an ambiguity as to which separator to use at a particular point (e.g., because one separator is a prefix of another) the separator with the highest priority should be used. Delimiters can be reused and the output from the function should be an ordered sequence of substrings. Test your code using the input string “a!===b=!=c” and the separators “==”, “!=” and “=”. For these inputs the string should be parsed as "a" (!=) "" (==) "b" (=) "" (!=) "c", where matched delimiters are shown in parentheses, and separated strings are quoted, so our resulting output is "a", empty string, "b", empty string, "c". Note that the quotation marks are shown for clarity and do not form part of the output. Extra Credit: provide information that indicates which separator was matched at each separation point and where in the input string that separator was matched.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Multisplit step by step in the Julia programming language

The provided split function in the Julia programming language is used to split a given string s into multiple substrings based on the specified regular expression delimiter r".*.". In this case, the delimiter is defined as a regular expression that includes three patterns separated by | (pipe): "==|!=|=".

Here's how the code works:

  1. split(s, r"==|!=|="): This line of code splits the string s into substrings based on the regular expression delimiter r".*.". The delimiter pattern includes the following:

    • "==": Matches the "==" string.
    • "!=": Matches the "!=" string.
    • "=": Matches a single equal sign.

  2. The split function returns an Array of SubString objects, where each substring represents a part of the original string that was separated by the delimiter.

  3. The resulting array has 5 elements, as shown in the output:

    • "a": The first substring before the first delimiter.
    • "": An empty substring because there's no text between the first and second delimiters.
    • "b": The substring between the second and third delimiters.
    • "": Another empty substring because there's no text between the third and fourth delimiters.
    • "c": The substring after the fourth delimiter (i.e., the last part of the string).

In summary, the split function splits the string s into substrings based on the provided regular expression delimiter, and it returns an array of substrings. In this case, the delimiter pattern matches "==" and "!=" strings, which results in the string being split into five substrings.

Source code in the julia programming language

julia> split(s, r"==|!=|=")
 5-element Array{SubString{String},1}:
  "a"
  ""
  "b"
  ""
  "c"

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