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package for pattern matching with regular expressions
a regular expression
a special sequence of characters that helps you match or find other strings or sets of strings, using a specialized syntax held in a pattern.
A Pattern object is a compiled representation of a regular expression.
A Matcher object is the engine that interprets the pattern and performs match operations against an input string.
A PatternSyntaxException object is an unchecked exception that indicates a syntax error in a regular expression pattern.