raku - How to split a string based on comma, but not based on comma in double quote

Raku - How to split a string based on comma, but not based on comma in double quote

In Raku (formerly known as Perl 6), you can split a string based on a comma while ignoring commas within double quotes using a regular expression. Here's an example:

my $input = 'apple,orange,"banana,grape",cherry'; my @result = $input ~~ m:g/ \" ( [^\" ]* ) \" | ([^,]*) /; say @result;

In this example:

  • m:g/ \" ( [^\" ]* ) \" | ([^,]*) / is a regex pattern that matches either text within double quotes or text without commas.
  • [^\" ]* matches any character except a double quote or space.
  • The | operator serves as an alternation, allowing the pattern to match either text within double quotes or text without commas.

After applying the regex pattern with m:g/ ... /, the result will be an array (@result) containing the substrings separated based on the specified conditions.

Keep in mind that this example assumes that double quotes within the quoted text are represented as \". If your input uses a different escaping mechanism, you might need to adjust the regex accordingly.

Examples

  1. "Raku split string based on comma outside double quotes"

    • Code:
      my $str = 'one,"two,three",four'; my @result = $str.split(/ ','+ (?: '"' [^'"']* '"' )? ','+ /);
    • Description: Uses a regex to split the string based on commas outside double quotes, preserving quoted sections.

  2. "Raku split CSV string excluding commas in double quotes"

    • Code:
      my $csv_string = 'name,age,"city, country",gender'; my @result = $csv_string.split(/ ','+ (?: '"' \S* '"' )? ','+ /);
    • Description: Splits a CSV string based on commas while excluding commas within double quotes.

  3. "Raku split string with quoted sections"

    • Code:
      my $input = 'apple, "banana, cherry", date, "egg,fruit"'; my @result = $input.split(/ ','+ (?: '"' [^'"']* '"' )? ','+ /);
    • Description: Splits a string based on commas, considering quoted sections.

  4. "Raku split string with optional quotes"

    • Code:
      my $input = 'one,two,three,"four,five"'; my @result = $input.split(/ ','+ (?: '"' [^'"']* '"' )? ','+ /);
    • Description: Splits a string based on commas, allowing for optional quotes around values.

  5. "Raku split string excluding double quotes"

    • Code:
      my $text = 'one, "two,three", four'; my @result = $text.comb(/ ','+ (?: '"' [^'"']* '"' )? ','+ /);
    • Description: Uses the comb method to split a string based on commas while excluding double-quoted sections.

  6. "Raku split string with escaped quotes"

    • Code:
      my $input = 'one,"two, three",four,\"five,six\"'; my @result = $input.split(/ ','+ (?: '"' [^'"' \\]* (?: \\ . [^'"' \\]* )* '"' )? ','+ /);
    • Description: Handles escaped quotes within double-quoted sections while splitting the string based on commas.

  7. "Raku split string with optional white spaces"

    • Code:
      my $text = 'apple, "banana, cherry" , date, "egg,fruit"'; my @result = $text.split(/ \s* ','+ \s* (?: '"' [^'"']* '"' \s* )? \s* ','+ \s* /);
    • Description: Splits a string based on commas, considering optional white spaces around values and quoted sections.

  8. "Raku split string with variable whitespace"

    • Code:
      my $input = 'one,"two, three", four, "five, six"'; my @result = $input.split(/ \s* ','+ \s* (?: '"' \s* [^'"']* \s* '"' \s* )? \s* ','+ \s* /);
    • Description: Splits a string with variable whitespace around commas and within double-quoted sections.

  9. "Raku split string with multiple delimiters"

    • Code:
      my $input = 'one, "two; three", four, "five; six"'; my @result = $input.split(/ ','+ (?: '"' [^'"']* '"' )? ';' ','+ /);
    • Description: Splits a string based on both commas and semicolons, considering double-quoted sections.

  10. "Raku split string with nested double quotes"

    • Code:
      my $input = 'one, "two, ""three""", four, "five, ""six"""'; my @result = $input.split(/ ','+ (?: '"' [^'"']* (?: '""' [^'"']* )* '"' )? ','+ /);
    • Description: Handles nested double quotes within double-quoted sections while splitting the string based on commas.

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