Python 3

Question

User defined functions in regular expressions

Answer 1

Didn't get exactly what is meant ?

But may be this is answer.

def myfunc():
print('This is user defined function')

myfunc()

parameter can be passed if necessary.

def myfunc(x,y):
return x+y

print('The sum is: ',myfunc(32,45)

RegEx
#To import regular expression
- import re

more about regular expression:
https://www.programiz.com/JUMP_LINK__&&__python__&&__JUMP_LINK-programming/regex