在python中从字符串中提取名称

import re

def extract_name_from_string(string):
    pattern = r'(\b[A-Z][a-zA-Z]+\b)'
    match = re.search(pattern, string)
    if match:
        return match.group(1)
    else:
        return None

string = "Hello, my name is John Doe."
name = extract_name_from_string(string)
print(name)  # Output: John

def extract_name_from_string(string):
    words = string.split()
    for word in words:
        if word[0].isupper() and word[1:].islower():
            return word
    return None

string = "Hello, my name is John Doe."
name = extract_name_from_string(string)
print(name)  # Output: John