For example, matches any character not in the range m through z. Matches any character not in the specified range. For example, "" matches any lowercase alphabetic character in the range a through z.Ī negative range characters. Matches any character in the specified range. For example, matches the p in plain.Ī range of characters. ![]() For example, matches the a in plain.Ī negative character set. Matches any one of the enclosed characters. For example, o is equivalent to o?.Ī character set. If you need to include the parentheses characters into a subexpression, use \( or \). If you need to refer the matched substring somewhere outside the current regular expression (for example, in another regular expression as a replacement string), you can retrieve it using the dollar sign $num, where num = 1.n. ![]() If you need to use the matched substring within the same regular expression, you can retrieve it using the backreference \num, where num = 1.n. Thus a regex operator can be applied to the entire group. If a part of a regular expression is enclosed in parentheses, that part of the regular expression is grouped together. Matches subexpression and remembers the match. Matches any single character except a newline character. For example, a?ve? matches the ve in never. Matches the preceding character zero or one time. For example, "zo " matches zoo but not z. Matches the preceding character one or more times. For example, "zo*" matches either z or zoo. Matches the preceding character zero or more times. The sequence \\ matches \ and \( matches (. We match two strings to the pattern and print the output (a Boolean returned by the matches() method).Marks the next character as either a special character or a literal. The matcher method creates a matcher that matches the given input against the pattern. This pattern can be matched with any character sequence against the regular expression using the Matcher object. We’ll use this pattern to make a Matcher object later. The compile() method creates a pattern from the specified regular expression. A password must be at least 8 characters long and no more than 24 characters long.At least one special character, such as ! #
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