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Learning AWK Programming by Shiwang Kalkhanda

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Complemented bracket expressions

A complemented bracket expression is one in which the first character after the [ must be caret, ^. This character class matches any character except those in the square brackets. For example, [^abc] will match any character but not 'a', 'b', or 'c'. Similarly, [^0-9] matches any character except a digit.

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