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fix(core): align char classes and escapes with java.util.regex. - #323
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- `.` and negated classes (`[^a]`, `\D`, `\W`, `\S`, `\H`, `\V`) cover all BMP chars except surrogates; negation is no longer affected by DOTALL/UNIX_LINES, so `[^a]` matches line terminators as in Pattern.
- `\s`/`\S` include `\x0B`, `\p{Space}` is `[ \t\n\x0B\f\r]`, `\p{all}` is any char, `\p{javaLowerCase}`, `\p{javaUpperCase}` and `\p{javaWhitespace}` use the respective Character predicates.
- Support `\h`, `\H`, `\v`, `\V`, `\f`, `\a`, `\e` and `\cX`; previously parsed as literal letters, generating strings the pattern rejects.
- Case-insensitive matching folds US-ASCII only unless UNICODE_CASE (or UNICODE_CHARACTER_CLASS) is set, as in Pattern.
- Drop Lazy in favour of plain constants.
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.and negated classes ([^a],\D,\W,\S,\H,\V) cover all BMP chars except surrogates; negation is no longer affected by DOTALL/UNIX_LINES, so[^a]matches line terminators as in Pattern.\s/\Sinclude\x0B,\p{Space}is[ \t\n\x0B\f\r],\p{all}is any char,\p{javaLowerCase},\p{javaUpperCase}and\p{javaWhitespace}use the respective Character predicates.\h,\H,\v,\V,\f,\a,\eand\cX; previously parsed as literal letters, generating strings the pattern rejects.