Regular Expression Exercises

These exercises accompany the Regular Expressions tutorial presented by Trey Hunner at PyCon 2017.

Testing an exercise by name

$ python test.py has_vowel
Testing function has_vowel

.......
----------------------------------------------------------------------
Ran 7 tests in 0.000s

OK

You will see OK if your code passes the tests and FAILED if your code fails one or more tests.

Forgot the exercise name?

If you're not sure of the function name for your exercise, just run the test.py file without any arguments to see a list of all exercise names:

$ python test.py
Please select a function to test

Functions that may be tested:
[01]  has_vowel: Return True iff the string contains one or more vowels.
[02]  is_integer: Return True iff the string represents a valid integer.
[03]  is_fraction: Return True iff the string represents a valid fraction.
[04]  is_valid_time: Return True iff the string represents a valid 24 hour time.
[05]  is_valid_date: Return True iff the string represents a valid YYYY-MM-DD date.
[06]  tetravocalic: Return a list of all words that have four consecutive vowels.
[07]  hexadecimal: Return a list of all words consisting solely of the letters A to F.
[08]  hexaconsonantal: Return a list of all words with six consecutive consonants.
[09]  possible_words: Return possible word matches from a partial word.
[10]  five_repeats: Return all words with at least five occurrences of the given letter.
[11]  is_number: Return True iff the string represents a decimal number.
[12]  is_hex_color: Return True iff the string represents an RGB hex color code.
[13]  abbreviate: Return an acronym for the given phrase.
[14]  palindrome5: Return a list of all five letter palindromes.
[15]  double_double: Return words with a double repeated letter with one letter between.
[16]  repeaters: Return words that consist of the same letters repeated two times.
[17]  get_extension: Return the file extension for a full file path.
[18]  normalize_jpeg: Return the filename with jpeg extensions normalized.
[19]  normalize_whitespace: Replace all runs of whitespace with a single space.
[20]  compress_blank_lines: Compress N or more empty lines into just N empty lines.
[21]  normalize_domain: Normalize all instances of treyhunner.com URLs.
[22]  convert_linebreaks: Convert linebreaks to HTML.
[23]  have_all_vowels: Return all words at most 9 letters long that contain all vowels.
[24]  no_repeats: Return all words with 10 or more letters and no repeating letters.
[25]  to_pig_latin: Convert English phrase to Pig Latin.
[26]  encode_ampersands: HTML-encode all & characters.
[27]  camel_to_underscore: Convert camelCase strings to under_score.
[28]  get_inline_links: Return a list of all inline links.
[29]  find_broken_links: Return a list of all broken reference-style links.
[30]  get_markdown_links: Return a list of all markdown links.

What function would you like to test?

You will see a list of all exercises. Note that each exercise has a name (e.g. has_vowel) and a number (e.g. 01).

You can type in the name or number of the exercise to run it.

Solving an exercise

To solve an exercise, navigate to the appropriate exercise module and find the exercise function. For example:

def has_vowel(string):
    """Return True iff the string contains one or more vowels."""

Modify this function to return the expected result for any input. Make sure to use regular expressions in your answer!