Validating regular expression

The usual context of wildcard characters is in globbing similar names in a list of files, whereas regexes are usually employed in applications that pattern-match text strings in general.

The concept came into common use with Unix text-processing utilities.

For example, is a precise pattern (match just 'a').

The metacharacter syntax is designed specifically to represent prescribed targets in a concise and flexible way to direct the automation of text processing of a variety of input data, in a form easy to type using a standard ASCII keyboard.

=.*[@#$%]) # must contains one special symbols in the list "@#$%" . mkyo Ng12* , special symbol “*” is not allow here 4. MKYONG12$ , lower case character is required Unit test with Test NG.

# match anything with previous condition checking # length at least 6 characters and maximum of 20 ) # End of group Whole combination is means, 6 to 20 characters string with at least one digit, one upper case letter, one lower case letter and one special symbol (“@#$%”). Password is valid : [email protected] , true Password is valid : mk YOn12$ , true Password is valid : m [email protected] , false Password is valid : [email protected] , false Password is valid : mkyo Ng12* , false Password is valid : mkyon G$$ , false Password is valid : MKYONG12$ , false PASSED: Valid Password Test([ String;@116471f) =============================================== com.mkyong.regex.

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