Computer scienceProgramming languagesPythonPython librariesRegular expressions

Groups and alternations

Theory

What year is it today?

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Now, consider a template for a string containing a date. Let's agree to accept the following formats of date:

  • D(D)/M(M)/YYYY

  • D(D).M(M).YYYY

DD and MM can consist either of two or one digits, YYYY is always a four-digit expression. The digits should be separated either by a slash character / or by a dot . . One date can contain only slashes or only dots as separators.

After writing the template, take a string from the input, and compare it against the template. If there's a match (the result of match() is not None), output the year mentioned in the string. If there's no match, output None.

Examples of valid dates: 02.12.1997, 02/03/1965, 1.01.2000.

Examples of invalid dates: 10.100.2105, 15.03.19114.

Write a program in Python 3
import re


# put your regex in the variable template
template = ""
string = input() # do not output an input message
# compare the string and the template
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