Filtering phone numbers
Now, you need to write a script for a cell-phone searcher. It should scan a list of phone numbers and return those that meet certain characteristics.
The phone numbers in the list have the structure:
- Optional area code: 3 numbers
- Prefix: 4 numbers
- Line number: 6 numbers
- Optional extension: 2 numbers
E.g. 654-8764-439434-01.
You decide to use .findall() and the non-capturing group's negative lookahead (?!) and negative lookbehind (?<!).
The list cellphones, containing three phone numbers, and the re module are loaded in your session. You can use print() to view the data in the IPython Shell.
이 연습은 강의의 일부입니다
Regular Expressions in Python
실습형 인터랙티브 연습
이 예제를 이 샘플 코드를 완성하여 풀어보세요.
for phone in cellphones:
# Get all phone numbers not preceded by area code
number = re.____(r"(____-)____-____-____", ____)
print(number)