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https://github.com/rjNemo/exercism-elixir
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52 lines
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2.6 KiB
Markdown
52 lines
No EOL
2.6 KiB
Markdown
# Hints
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## General
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- Review regular expression patterns from the introduction. Remember, when creating the pattern a string, you must escape some characters.
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- Read about the [`Regex` module][regex-docs] in the documentation.
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- Read about the [regular expression sigil][sigils-regex] in the Getting Started guide.
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- Check out this website about regular expressions: [Regular-Expressions.info][website-regex-info].
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- Check out this website about regular expressions: [Rex Egg -The world's most tyrannosauical regex tutorial][website-rexegg].
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- Check out this website about regular expressions: [RegexOne - Learn Regular Expressions with simple, interactive exercises.][website-regexone].
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- Check out this website about regular expressions: [Regular Expressions 101 - an online regex sandbox][website-regex-101].
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- Check out this website about regular expressions: [RegExr - an online regex sandbox][website-regexr].
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## 1. Match the day, month, and year from a date
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- Remember to return a string representing the regular expression pattern.
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- Review how to create _character classes_ or use _shorthand character classes_.
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- Review _quantifiers_.
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- A day is one or two digits.
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- A month is one or two digits.
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- A year is four digits.
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## 2. Match the day of the week and the month of the year
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- Review how to write a pattern to match _string literals_.
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- Review _alternations_.
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- Wrap the whole expression in a _group_.
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## 3. Capture the day, month, and year
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- Review how to write patterns for captures and named captures.
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- Reuse the `day/0`, `month/0`, `year/0`, `day_names/0`, and `month_names/0` functions that you already implemented.
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## 4. Combine the captures to capture the whole date
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- Remember, string interpolation may be used to join strings.
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- Reuse the `capture_day/0`, `capture_month/0`, `capture_year/0`, `capture_day_name/0`, and `capture_month_name/0` functions that you already implemented.
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## 5. Narrow the capture to match only on the date
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- Remembers, _anchors_ help to match the pattern to the **whole line**.
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- String interpolation may be used in the regular expression sigil syntax.
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- Reuse the `capture_numeric_date/0`, `capture_month_name_date/0`, and `capture_day_month_name_date/0` functions that you already implemented.
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[regex-docs]: https://hexdocs.pm/elixir/Regex.html
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[sigils-regex]: https://elixir-lang.org/getting-started/sigils.html#regular-expressions
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[website-regex-info]: https://www.regular-expressions.info
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[website-rexegg]: https://www.rexegg.com/
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[website-regexone]: https://regexone.com/
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[website-regex-101]: https://regex101.com/
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[website-regexr]: https://regexr.com/
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[website-regex-crossword]: https://regexcrossword.com/ |