意思：
Regular expressions are compiled into pattern objects, which have methods for various operations such as searching for pattern matches or performing string substitutions.
目的：转化成可操作的对象（用于：查找匹配 ｜ 替换），可重复使用
例子：
import re com = re.compile(‘[Pp]ython‘) def print_obj(obj): #Verify whether the string is found. if obj: print("Pattern found!") else: print("Pattern not found!") string1 = ‘Python crash course‘ obj1 = com.match(string1) print_obj(obj1) print("*" * 20) string2 = ‘Java crash course‘ obj2 = com.search(string2) print_obj(obj2)
re.compile和正则表达式直接匹配的区别
正则表达式每次使用会直接转换，使用re.compile可以重复进行想要的操作
原文：https://www.cnblogs.com/dennisD/p/Lovange.html