How to Effectively Replace Non-Printable Unicode Characters in Java Strings?

Replacing Non-Printable Unicode Characters in Java: A Comprehensive Approach

The question at hand concerns effectively replacing non-printable Unicode characters within Java strings. ASCII control characters can be handled efficiently using the following regex:

my_string.replaceAll("\p{Cntrl}", "?");

Additionally, ASCII non-printable characters, including accented characters, can be replaced with:

my_string.replaceAll("[^\p{Print}]", "?");

However, both approaches fall short when dealing with Unicode strings. A robust solution is required to address this challenge.

The Solution: Harnessing "p{C}"

The key to handling Unicode non-printable characters lies in employing the regex:

my_string.replaceAll("\p{C}", "?");

This regex effectively identifies and replaces all non-printable Unicode characters.

Understanding Unicode Regular Expressions

Java's java.util.regexPattern/String.replaceAll classes fully support Unicode regular expressions. The shorthand "p{C}" represents Unicode control characters.

By leveraging this approach, you can efficiently replace non-printable characters within Unicode strings, ensuring consistent string manipulation.

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