exercism-elixir/date-parser/HINTS.md

Hints

General

• Review regular expression patterns from the introduction. Remember, when creating the pattern a string, you must escape some characters.
• Read about the Regex module in the documentation.
• Read about the regular expression sigil in the Getting Started guide.
• Check out this website about regular expressions: Regular-Expressions.info.
• Check out this website about regular expressions: Rex Egg -The world's most tyrannosauical regex tutorial.
• Check out this website about regular expressions: RegexOne - Learn Regular Expressions with simple, interactive exercises..
• Check out this website about regular expressions: Regular Expressions 101 - an online regex sandbox.
• Check out this website about regular expressions: RegExr - an online regex sandbox.

1. Match the day, month, and year from a date

• Remember to return a string representing the regular expression pattern.
• Review how to create character classes or use shorthand character classes.
• Review quantifiers.
• A day is one or two digits.
• A month is one or two digits.
• A year is four digits.

2. Match the day of the week and the month of the year

• Review how to write a pattern to match string literals.
• Review alternations.
• Wrap the whole expression in a group.

3. Capture the day, month, and year

• Review how to write patterns for captures and named captures.
• Reuse the day/0, month/0, year/0, day_names/0, and month_names/0 functions that you already implemented.

4. Combine the captures to capture the whole date

• Remember, string interpolation may be used to join strings.
• 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.

5. Narrow the capture to match only on the date

• Remembers, anchors help to match the pattern to the whole line.
• String interpolation may be used in the regular expression sigil syntax.
• Reuse the capture_numeric_date/0, capture_month_name_date/0, and capture_day_month_name_date/0 functions that you already implemented.