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write a validDate Regex in Python


The problem

Your activity is to jot down a daily expression (regex) that may match a string provided that it incorporates at the very least one legitimate date, within the format [mm-dd] (that’s, a two-digit month, adopted by a splash, adopted by a two-digit date, surrounded by sq. brackets).

It is best to assume the yr in query is not a bissextile year. Subsequently, the variety of days every month ought to have are as follows:

    1. January – 31 days
    1. February – 28 days (leap years are ignored)
    1. March – 31 days
    1. April – 30 days
    1. Could – 31 days
    1. June – 30 days
    1. July – 31 days
    1. August – 31 days
    1. September – 30 days
    1. October – 31 days
    1. November – 30 days
    1. December – 31 days

All textual content outdoors a sound date could be ignored, together with different invalid dates.

Examples

"[01-23]" # January twenty third is a sound date
"[02-31]" # February thirty first is an invalid date
"[02-16]" # legitimate
"[ 6-03]" # invalid format
"ignored [08-11] ignored" # legitimate
"[3] [12-04] [09-tenth]" # December 4th is a sound date

The answer in Python code

Possibility 1:

import re

valid_date = re.compile(r"[("
    # Jan, Mar, May, Jul, Aug, Oct, Dec: 31 days
    "(0[13578]|1[02])-(0[1-9]|[12]d|3[01])|"
    # Feb: 28 days
    "02-(0[1-9]|1d|2[0-8])|"
    # Apr, Jun, Sep, Nov: 30 days
    "(0[469]|11)-(0[1-9]|[12]d|30)"
    ")]")

Possibility 2:

import datetime
from re import compile

class check_date(object):

    def __init__(self):
        self._rgxp = compile(r'(?P<date>[d{2}-d{2}])')

    def search(self, string):
        date = None
        search_date = self._rgxp.search(string)
        strive:
            date = datetime.datetime.strptime(search_date.group('date'), "[%m-%d]")
        besides BaseException:
            move

        if date: return date.date()


valid_date = check_date()

Possibility 3:

valid_date = compile('[((?!02-(?:29|30))(?:0[1-9]|1[012])-(?:0[1-9]|1[0-9]|2[0-9]|30)|(?:0[13578]|1[02])-31)]')

Check instances to validate our resolution

take a look at.describe("Fundamental exams")
take a look at.count on(valid_date.search("[01-23]")!=None, "January twenty third is a sound date")
take a look at.count on(valid_date.search("[02-31]")==None, "February thirty first is an invalid date")
take a look at.count on(valid_date.search("[02-16]")!=None , "legitimate")
take a look at.count on(valid_date.search("[ 6-03]")==None, "invalid format")
take a look at.count on(valid_date.search("ignored [08-11] ignored")!=None, "legitimate")
take a look at.count on(valid_date.search("[3] [12-04] [09-tenth]")!=None, "December 4th is a sound date")
take a look at.count on(valid_date.search("[02-00]")==None, "invalid format")
take a look at.count on(valid_date.search("[[[08-29]]]")!=None, "legitimate")
take a look at.count on(valid_date.search("[13-02]")==None, "invalid format")
take a look at.count on(valid_date.search("[02-[08-11]04]")!=None, "legitimate")
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