$ python3 phone.py 
Traceback (most recent call last):
  File "phone.py", line 14, in <module>
    check('+7 123 456-78-90')
  File "phone.py", line 3, in check
    if re.search(r'^(\+)?(?:[78][\s\(]?\d\d\d\)?\s?\d\d\d-?\d\d-?\d\d|\d\d\d\)?\s?\d\d\d-?\d\d-?\d\d)$', text) == None:
NameError: name 're' is not defined

def check(text):
    original = text
    chars = "()- "
    for c in chars: 
        text = text.replace(c, "")
    if (text.startswith('1') or (text.find(text,"+",1)) >= 0):
        print('Fail')
    else:
        print(original)

        
check('+7 123 456-78-90')
check('8(123)456-78-90')
check('7(123) 456-78-90')
check('1234567890')
check('123456789')
check('+9 123 456-78-90') 
check('+7 123 456+78=90')
check('+7(123 45678-90')
check('8(123  456-78-90')

Traceback (most recent call last):
  File "phone.py", line 28, in <module>
    check('+7 123 456-78-90')
  File "phone.py", line 22, in check
    if (text.startswith('1') or (text.find(text,"+",1)) >= 0):
TypeError: slice indices must be integers or None or have an __index__ method

if re.search(r'^(\+)?(?:[78][\s\(]?\d\d\d\)?\s?\d\d\d-?\d\d-?\d\d|\d\d\d\)?\s?\d\d\d-?\d\d-?\d\d)$', text) == None:

(?<mobile_operator_prefix>(\d{1,3})\

mobile_phone ::= local | international

digit ::= 0 | 1 | 2 | .... | 9

local ::= ....

mayton@ryzen-ssd:$ python3
Python 3.8.5 (default, Jul 28 2020, 12:59:40) 
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 
>>> print("Hello \
... world")
Hello world

String fuckenMultiline = "This\n " +
                            " is\n " +
                          " multiline\n";

FuckenUtils.multiline("This",
  " is",
  " multiline"

  """This
  is
  multiline"""