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граница слова (In regular expressions, a boundary that occurs when the current character is at the beginning of the target string and is one of the word characters A-Za-z0-9_, or when the current character position is past the end of the target string and the last character in the string is one of the word characters, or when the current character is one of the word characters and the preceding character is not, or when the current character is not one of the word characters and the preceding character is) |
