regex exercise answers

import re


# Has Vowels

def has_vowels(string):
    return bool(re.search(r'[aeiou]', string))


# Is Integer

def is_integer(string):
    return bool(re.search(r'^-?[0-9]+$', string))

def is_integer(string):
    return bool(re.search(r'^-?\d+$', string))


# Is Fraction

def is_fraction(string):
    return bool(re.search(r'^-?[0-9]+/0*[1-9]+[0-9]*$', string))

def is_fraction(string):
    return bool(re.search(r'^-?\d+/\d*[1-9]+\d*$', string))


# Valid Time

def is_valid_time(string):
    return bool(re.search(r'([0-1]\d|2[0-3]):[0-5]\d', string))


# Valid Date

def is_valid_date(string):
    return bool(re.search(r'\d{4}-[01]\d-[0-3]\d', string))

def is_valid_date(string):
    return bool(re.search(r'''
        (19|20) \d \d
        -
        ( 0[1-9] | 1[0-2] )
        -
        ( 0[1-9] | [12]\d | 3[01] )
    ''', string, re.VERBOSE))


# Tetravocalic

re.findall(r'\b.*[aeiou]{4}.*\b', dictionary)


# Hexadecimal Words

re.findall(r'\b[0-9a-f]+\b', dictionary)

re.findall(r'\b[a-f\d]+\b', dictionary)


# Nexaconsonantal

re.findall(r'\b.*[^aeiouy\s]{6}.*\b', dictionary)

re.findall(r'\b.*[bcdfghjklmnpqrstvwxz]{6}.*\b', dictionary)


# Crossword Helper

def possible_words(partial_word):
    pattern = r'\b{}\b'.format(partial_word.replace('_', '.'))
    return re.findall(pattern, dictionary, re.IGNORECASE)


# Repeat Letter

re.findall(r'\b.*n.*n.*n.*n.*n.*\b', dictionary)

re.findall(r'\b(?:.*n.*){5}\b', dictionary)