Python Language.

Making a Regex.

Describe some task that you might want to complete with a regex and create a regex to do it. With that, post both the task and your regex and what you think it will match and won't match. But it doesn't have to be super complex but it does have to match more than one string.

Example of a Regex-

class WatchListLinked:

def __init__(self, fname=""):

self.root = Node()

self.root.children = [Node('5'), Node('10'), Node('20'),

Node('50'), Node('100')]

if fname:

with open(fname) as fp:

for line in fp:

serial_number, denomination = line.split()

self.insert(serial_number, denomination)

self.validator = re.compile(r'^[A-M][A-L](?!0{8})\d{8}[A-NP-Y]$')

class WatchListDict:

def __init__(self, fname=""):

self.root = {'5': {}, '10': {}, '20': {}, '50': {}, '100': {}}

if fname:

file = open(fname, 'r')

for line in file:

serial_number, denomination = line.split()

self.insert(serial_number, denomination)

self.validator = re.compile(r'^[A-M][A-L](?!0{8})\d{8}[A-NP-Y]$')