正则表达式以获取有效的HTTP字符

Question

根据[RFC 1738] [1]

[1]：http://www.ietf.org/rfc/rfc1738.txt在HTTP标头，查询参数和路径参数中存在不安全字符，应将其过滤掉。我正在尝试为所有可以允许或列入白名单的字符获取正则表达式

Answer 1

看看https://docs.oracle.com/javase/9/docs/api/java/util/regex/Pattern.html中的“字符类”

节选：

Character classes
[abc]   a, b, or c (simple class)
[^abc]  Any character except a, b, or c (negation)
[a-zA-Z]    a through z or A through Z, inclusive (range)
[a-d[m-p]]  a through d, or m through p: [a-dm-p] (union)
[a-z&&[def]]    d, e, or f (intersection)
[a-z&&[^bc]]    a through z, except for b and c: [ad-z] (subtraction)
[a-z&&[^m-p]]   a through z, and not m through p: [a-lq-z](subtraction)