python - 检查字符串中的最后一个匹配字符

Question

我想查找字符串的最后一个字符是否为 .。我知道在 re 中使用 $ 更容易找到。但是，有没有一种不用re 就能找到. 的简单方法？ re 是否也比其他字符串操作模块更快？

string1 = "this is a string1."
string2 = "this is a string2."
string3 = "this is a string3."

字符串总是在最后包含.。

Answer 1

使用str.endswith :

>>> string1 = "this is a string1."
>>> string1.endswith('.')
True

>>> string4 = "this is a string1?"
>>> string4.endswith('.')
False

根据 Regular expression HOWTO - Python documentation :

Regular expression patterns are compiled into a series of bytecodes which are then executed by a matching engine written in C. For advanced use, it may be necessary to pay careful attention to how the engine will execute a given RE, and write the RE in a certain way in order to produce bytecode that runs faster.