Regular expression to remove ASCII control characters in Java

I've been reading that the below pattern used as part of String#replaceAll() in Java

"[\\p{Cntrl}&&[^\r\n\t]]"

removes various non-printable ASCII characters from it.

How does one interpret the above incantation:

• which characters are included as part of those control chars to be removed?
• what does the && stand for?
• does ^ mean it only looks at the beginning of the line?

How can I obtain a comprehensive non-technical explanation of the above expression?

"... which characters are included as part of those control chars to be removed? ..."

You can find this information in the Pattern class JavaDoc.

Pattern – POSIX character classes (US-ASCII only) – (Java SE 20 & JDK 20).

\p{Cntrl}    A control character: [\x00-\x1F\x7F]

Which is, from values 0 through 1f, and value 7f.

"... what does the && stand for? ..."

The && is part of the syntax for a character class intersection.

For example, the following will match any character, a through z, except for x and y.

[a-z&&[^xy]]

"... does ^ mean it only looks at the beginning of the line? ..."

Not when within a character class, [ ].