Python中str包含字符

str1 = "Welcome to geek-docs.com"
char = "e"

if char in str1:
    print(f"The character {char} is in the string.")
else:
    print(f"The character {char} is not in the string.")

The character e is in the string.

str2 = "Hello, geek-docs.com"
char = "o"

count = str2.count(char)
if count > 0:
    print(f"The character {char} appears {count} times in the string.")
else:
    print(f"The character {char} does not appear in the string.")

The character o appears 2 times in the string.

import re

str3 = "geeky geek-docs.com"
pattern = r"geek\w+"

if re.search(pattern, str3):
    print(f"The pattern {pattern} is found in the string.")
else:
    print(f"The pattern {pattern} is not found in the string.")

The pattern geek\w+ is found in the string.