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 ! # & (), must be included in the password.At least one uppercase character is required in the password.At least one lowercase character is required in the password. At least one digit must be included in the password.This pattern is used to check if a password meets the following criteria. Here we have a regular expression regex_pattern as a String. When we create an instance of the Pattern class, we pass the regular expression as a string. The Pattern class represents a regular expression. In this example, we used the Pattern and Matcher classes from the package. , +, *, ?, ^, $, (, ),, matches aaa, aaaa, aaaaa ? Matches the preceding element zero or one time ab?c matches ac, abc + Matches the preceding element one or more times ab+c matches abc, abbc, abbbc, etc., but not ac | the choice operator, it matches either the expression before or expression after the operator | ab|def matches either ab or def \ Escape or backslash common escape sequences like \n or newline, \t for tab Example of Using Regex Special Characters in Java Regular expressions make use of special characters such as. Regex is a type of textual syntax representing patterns for text matching. Special Characters in Java Regular Expressions We’ll look at how special characters are utilized in regex. It simplifies and reduces the number of lines in a program. Regex (Regular Expression) is a useful tool for manipulating, searching, and processing text strings. Example of Using Regex Special Characters in Java.Special Characters in Java Regular Expressions.
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