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regular expression
2022-07-28 05:19:00 【Pony_ eighteen】
Required regular expressions ：
Suggested format ： Metacharacters ＋ qualifiers
Metacharacters ：
.: Any single character
\d: Any single number
[0~9]: Equivalent 0~9
[a~zA~Z]： Equivalent 26 English letters
qualifiers ：
+： Match at least greater than 1 Time
？： matching 0 Time or 1 Time
*： Greedy matching
{n},{n,m},{m}： Match limit times
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regular expression