正则表达式匹配ASCII非字母数字字符

Question

I need a regex to match ASCII non-alphanumeric characters. The regex should not match non-ASCII characters. I am using the following:

   "[\\u0000-\\u002f\\u003a-\\u0040\\u005b-\\u0060\\u007b-\\u007f]"

Can I simplify this regex ?

Answer 1

Yes you can use a character class intersection. Example:

[\\p{ASCII}&&\\P{Alnum}]

This means: intersection between all ascii characters and all non alphanumeric characters

Answer 2

You can use this regex in Java

^(?=[^0-9a-zA-Z]+$)\p{ASCII}+$

OR else:

^(?!\p{Alnum}+$)\p{ASCII}+$

Answer 3

You can use a set intersection:

"[\\p{ASCII}&&[^\\p{Alnum}]]"

Read: Reference - What does this regex mean?