Python如何实现句子指定单词前后添加双星号**

方案1：简单全局替换 #

如果不需要区分目标单词是否是独立完整的词汇，直接用字符串自带的replace方法即可：

# 示例参数
original_str = "He enjoys playing cricket in summer"
target_word = "cricket"

# 替换逻辑
processed_str = original_str.replace(target_word, f"**{target_word}**")

print(processed_str)
# 输出结果：He enjoys playing **cricket** in summer

方案2：全词匹配替换 #

如果需要避免部分匹配的误替换（例如目标词是cat时，不会错误替换category里的cat片段），可以用正则表达式匹配单词边界：

import re

# 示例参数
original_str = "He enjoys playing cricket in summer, his cricket bat is brand new"
target_word = "cricket"

# 替换逻辑：\b 匹配单词边界，re.escape 规避目标词含正则特殊字符的问题
processed_str = re.sub(
    rf"\b{re.escape(target_word)}\b",
    f"**{target_word}**",
    original_str
)

print(processed_str)
# 输出结果：He enjoys playing **cricket** in summer, his **cricket** bat is brand new

内容的提问来源于stack exchange，提问作者Raj Salla