Contents

• 替换字符串示例

  • re.sub(pattern,repl,string,count,[flags]) 替换子字符串，返回替换后的字符串

  • re.subn(pattern,repl,string,count,[flags]) 作用与sub()相同返回一个二元元祖，第一个是匹配结果，第二个是匹配次数

    • 代码示例

11.3. 替换字符串示例

11.3.1. re.sub(pattern,repl,string,count,[flags]) 替换子字符串，返回替换后的字符串

11.3.2. re.subn(pattern,repl,string,count,[flags]) 作用与sub()相同返回一个二元元祖，第一个是匹配结果，第二个是匹配次数

代码示例

import re

s = "Life can be bad"
print(re.sub("bad", "good", s))  # Life can be good
print(re.sub("bad|be", "good", s))  # Life can good good
print(re.sub("bad|be", 'good', s, 1))  # 用“good”替换“bad”或者“be”,只替换一次         # Life can good bad
print(re.subn("bad|be", "good", s, 1))  # 用“good”替换“bad”或者“be”,只替换一次        # ('Life can good bad', 1)

r = re.subn("bad|be", "good", s)
print(r[0])  # 输出元祖第一项            # Life can good good
print(r[1])  # 输出元祖第二项               #  2

import re

print("str1:- ")
str1 = "Sky is blue. Sky is beautiful."
print("Original: ", str1)
p = re.subn('beautiful', 'stunning', str1)
print("Replaced: ", p)

print()
print("str_line:- ")
str_line = 'Peter Piper picked a peck of pickled peppers. How many pickled peppers did Peter Piper pick?'
print("Original: ", str_line)
p = re.subn('Peter', 'Mary', str_line)
print("Replaced: ", p)