JAVA Q
The criteria for a valid simple username is as follows:
You are required to complete the regular expression only. Your answer will be tested automatically.
For example: the following are valid username:
And the following are invalid username:
Test | Result |
---|---|
isUsername("abc001"); isUsername("128.1.1"); |
abc001: matches 128.1.1: does not match |
public static void isUsername(String inputStr) {
String regExpStr = ""; //complete this
Pattern pattern = Pattern.compile(regExpStr);
Matcher matcher = pattern.matcher(inputStr);
System.out.printf("%s\n", matcher.matches()? inputStr + ":
matches": inputStr + ": does not match");
}
Java code
============================================================================================
import java.util.regex.*;
public class UserNameValidation {
public static void isUsername(String inputStr)
{
String regExpStr =
"^[a-zA-Z][a-zA-Z0-9]{3,20}$"; //complete this
Pattern pattern =
Pattern.compile(regExpStr);
Matcher matcher =
pattern.matcher(inputStr);
System.out.printf("%s\n",
matcher.matches()? inputStr + ": matches": inputStr + ": does not
match");
}
public static void main(String[] args) {
// TODO Auto-generated method
stub
isUsername("abc001");
isUsername("128.1.1");
isUsername("128aa");
isUsername("aa");
}
}
============================================================================================
Output
JAVA Q The criteria for a valid simple username is as follows: It should start with...
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