What are the Unicode-aware equivalents for Java's \w and \b in regular expressions?

Unicode Equivalents for w and b in Java Regular Expressions?

Java regexes have limited character class shorthands (w and b) compared to other modern regex implementations. In Java, w matches only [A-Za-z0-9_], restricting word matching capabilities. Additionally, b's word boundary semantics deviate from both w and Unicode's definitions.

Unicode-Aware Equivalents

Fortunately, custom Unicode-aware equivalents have been developed to overcome these limitations. Here are the replacements:

Understanding the Boundaries (b and B)

Boundaries match positions where word characters transition to non-word characters or vice versa. A boundary is defined as:

Translated into regex syntax:

Likewise, the non-boundary (B) equivalent is:

Incorporating Unicode Support in Java

To incorporate these Unicode equivalents into your Java regexes, you can use a string rewrite function to transform the pattern before compilation. Here's an example using a custom function called rewrite:

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