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Matches any single character that is NOT an ASCII letter (a-z, A-Z), digit (0-9), Cyrillic letter, or space. Since \p{Cyrillic} covers the entire Unicode Cyrillic script in PCRE, this pattern catches punctuation, symbols, and characters from other alphabets. It's useful for input validation, detecting special/injection characters, or stripping unwanted symbols from mixed English/Russian text.