一个正则表达式写不出来 - V2EX

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To: =?GB2312?B?s8LR9A==?= , =?GB2312?B?0e7V8buq?= , =?GB2312?B?ts69qNOi?= , =?GB2312?B?wO7RxcX0?= , =?GB2312?B?wfXX07vU?= Cc: =?GB2312?B?wfXA2g==?= , =?GB2312?B?wfW7qNHT?= Subject: =?GB2312?B?u9i4tDogu9i4tDogcGPXqNawvNK9zMrTxrVidWc=?=

如何匹配 To 到 Cc:之间的字符串，Cc:有时候可能不存在，所以不能用 To:( =\?.*\?= )Cc:，想了半天没想出来，求解答，谢谢

12 replies • 2019-02-22 19:26:28 +08:00

1

xiangyuecn

Feb 22, 2019

1

邮件头格式还是蛮复杂的，可能跨多行

To: ([^\r\n]+(?:\r\n\s+[^\r\n]+)*)

2

Telegram

Feb 22, 2019

1

注意冒号：

=\?[^:]*\?=

3

Telegram

Feb 22, 2019

1

从 To：开始，?=结尾，中间不能含有冒号:，问题解决

4

laoyur

Feb 22, 2019

1

To: (?:\s*=\?.+?\?=\s*,?)+

5

xiangyuecn

Feb 22, 2019

\r\n 有点问题。。。不研究了

6

Raisu

Feb 22, 2019 via Android

用 split

7

lastpass

Feb 22, 2019 via Android

用 antlr

8

liuxu

OP

Feb 22, 2019

@laoyur 多谢大佬，试过这个，最后,?一直没想到

9

bzw875

Feb 22, 2019

str = str.split('fuck:')[0]
str = str.replace('To', '')

10

junkman

Feb 22, 2019

1

To:( =\?.*\?= )(Cc|Subject):

NOTE: Assume `Subject' always present

see: https://regex101.com/r/l7xxeN/2/

11

junkman

Feb 22, 2019

Only one addressee case failed :-(

12

bzw875

Feb 22, 2019

str = str.split('Cc:')[0];
str = str.replace('To', '');
不小心写错了，其实代码可以实现的地方，别用正则表达式，可读性差

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