Python 字符串匹配

Python 字符串匹配技术在文本处理和数据分析中扮演着重要角色。通过字符串匹配，我们可以快速找到符合特定模式的文本，从而进行进一步的处理和分析。本文将介绍一些常见的字符串匹配方法，并提供相关的代码示例。

python
import re
def is_valid_email(email):
    pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
    if re.match(pattern, email):
        return True
    else:
        return False
email = "example@example.com"
if is_valid_email(email):
    print("有效的邮箱地址")
else:
    print("无效的邮箱地址")

python
text = "Python is a powerful programming language"
substring = "powerful"
index = text.find(substring)
if index != -1:
    print("子串在字符串中的位置为", index)
else:
    print("字符串中不存在该子串")

python
import re
text = "The price is $100.00"
pattern = r'\d+'
replacement = "#"
new_text = re.sub(pattern, replacement, text)
print("替换后的字符串为：", new_text)

python
text = "Python is a powerful programming language"
words = text.split()
print("分割后的单词列表为：", words)
new_text = " ".join(words)
print("连接后的字符串为：", new_text)