Section 14.7 Regular Expressions, Class Pattern and Class Matcher
• Regular expressions (p. 624) are sequences of characters and symbols that define a set of strings. They’re useful for validating input and ensuring that data is in a particular format.
• String method matches (p. 624) receives a string that specifies the regular expression and matches the contents of the String object on which it’s called to the regular expression. The method returns a boolean indicating whether the match succeeded.
• A character class is an escape sequence that represents a group of characters. Each character class matches a single character in the string we’re attempting to match with the regular expression.
• A word character (\w; p. 624) is any letter (uppercase ...
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