Step by Step solution about How to resolve the algorithm Strip comments from a string step by step in the Mathematica/Wolfram Language programming language

The Wolfram programming language code you provided performs the following tasks:

1. Defines a string a that contains two lines of text, with a semicolon (;) and a pound sign (#) in the second line.

2. Uses the StringReplace function to replace all occurrences of a regular expression pattern in the string a with a new string. The regular expression pattern "[ ]+[#;].+[\n]" matches any sequence of one or more whitespace characters followed by a pound sign (#), a semicolon (;), and one or more characters, followed by a newline character (\n). The replacement string "\n" simply inserts a newline character in place of the matched pattern. This effectively splits the second line of the string a into two lines.

3. Uses the StringReplace function again to replace all occurrences of a different regular expression pattern in the string b (which is the result of the previous operation) with an empty string. The regular expression pattern "[ ]+[#;].+$" matches any sequence of one or more whitespace characters followed by a pound sign (#), a semicolon (;), and any number of characters until the end of the line ($). The replacement string "" simply deletes the matched pattern from the string. This effectively removes the second line of the string b.

4. Finally, the result of the last operation is displayed in FullForm, which provides a detailed representation of the expression, including its structure and any attributes.

In summary, the code processes a string to split a line that contains a semicolon and a pound sign into two lines and then removes the second line. The StringReplace function is used with regular expressions to perform these operations.

a = "apples, pears # and bananas
  apples, pears ; and bananas";
b = StringReplace[a, RegularExpression["[ ]+[#;].+[\n]"] -> "\n"];
StringReplace[b, RegularExpression["[ ]+[#;].+$"] -> ""] // FullForm