hello 
I'm trying to add the area code to phone numbers. I used an inherited method where the phone numbers should be formatted, but when I add a number to the phone field, my code doesn't work as expected.

I have an issue where, when I add a number to the field and press enter or click elsewhere, the format according to my code should be +52 1 xx xxxx xxxx. However, for some numbers, it doesn't respect this format and appears as +52 xx xxxx xxxx, and in some cases as +52 xxx xxx xxxx. 

Here is my code:

def format_phone(self, phone_number): 
​clean_number = re.sub(r'\D', '', phone_number) # Remove all non-numeric characters if if ​len(clean_number) == 10: # If it's a 10-digit number 

​ ​return '+52 1 ' + clean_number[:2] + ' ' + ​clean_number[2:6] + ' ' + clean_number[6:] ​else: return phone_number # Return the number unchanged ​if it doesn't have 10 digits

@api.onchange('phone') def _onchange_phone(self): 

​if self.phone: 

​ ​phone_pattern = re.compile(r'^\+52\s1\s\d{2}\s\d{4}\s\d{4}$') # Expected format 

​ ​clean_number = re.sub(r'\D', '', self.phone) 

​ ​ ​if not phone_pattern.match(self.phone) and len(clean_number) == 10: 

​ ​ ​ ​self.phone = ​self.format_phone(self.phone) 

​ ​​ ​_logger.info("Formatted phone number: %s", self.phone)

@api.onchange('mobile') 

def _onchange_mobile(self): 

​if self.mobile: 

​ ​phone_pattern = re.compile(r'^\+52\s1\s\d{2}\s\d{4}\s\d{4}$') # Expected format 

​ ​clean_number = re.sub(r'\D', '', self.mobile) 

​ ​​if not phone_pattern.match(self.mobile) and len(clean_number) == 10:

​  ​ ​ ​self.mobile = self.format_phone(self.mobile) 

​ ​ ​ ​_logger.info("Formatted mobile number: %s", self.mobile)