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Valid Username Regular Expression

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Valid Username Regular Expression

Java HackerRank

Difficulty Max Score Success Ratio
Easy 20 95.74%

You are updating the username policy on your company's internal networking platform. According to the policy, a username is considered valid if all the following constraints are satisfied:

  • The username consists of [SVG image] to [SVG image] characters inclusive. If the username consists of less than [SVG image] or greater than [SVG image] characters, then it is an invalid username.
  • The username can only contain alphanumeric characters and underscores (_). Alphanumeric characters describe the character set consisting of lowercase characters [SVG image] , uppercase characters [SVG image] , and digits [SVG image] .
  • The first character of the username must be an alphabetic character, i.e., either lowercase character [SVG image] or uppercase character [SVG image] .

For example:

Username Validity
[SVG image] INVALID; Username length < 8 characters
[SVG image] VALID
[SVG image] VALID
[SVG image] INVALID; Username begins with non-alphabetic character
[SVG image] INVALID; '?' character not allowed

Update the value of regularExpression field in the UsernameValidator class so that the regular expression only matches with valid usernames.

Input Format

The first line of input contains an integer [SVG image] , describing the total number of usernames. Each of the next [SVG image] lines contains a string describing the username. The locked stub code reads the inputs and validates the username.

Constraints

  • [SVG image]
  • The username consists of any printable characters. Output Format

For each of the usernames, the locked stub code prints Valid if the username is valid; otherwise Invalid each on a new line.

Sample Input 0

8
Julia
Samantha
Samantha_21
1Samantha
Samantha?10_2A
JuliaZ007
Julia@007
_Julia007

Sample Output 0

Invalid
Valid
Valid
Invalid
Invalid
Valid
Invalid
Invalid

Explanation 0

Refer diagram in the challenge statement.

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View Solution : Valid Username Regular Expression

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