Regular expression username pattern
This regular expression refers to a pattern which accepts 5 to 15 characters with any lower case character, digit or special symbol “_-” only.
Example
package com.w3spoint;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegexTest {
private static final String PATTERN = "^[a-z0-9_-]{5,15}$";
public static void main(String args[]){
List<String> values = new ArrayList<String>();
values.add("Jai_singh");
values.add("Jai@5");
values.add("jai12345");
values.add("jai_singh");
Pattern pattern = Pattern.compile(PATTERN);
for (String value : values){
Matcher matcher = pattern.matcher(value);
if(matcher.matches()){
System.out.println("Username "+ value +" is valid");
}else{
System.out.println("Username "+ value +" is invalid");
}
}
}
} |
package com.w3spoint;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class RegexTest {
private static final String PATTERN = "^[a-z0-9_-]{5,15}$";
public static void main(String args[]){
List<String> values = new ArrayList<String>();
values.add("Jai_singh");
values.add("Jai@5");
values.add("jai12345");
values.add("jai_singh");
Pattern pattern = Pattern.compile(PATTERN);
for (String value : values){
Matcher matcher = pattern.matcher(value);
if(matcher.matches()){
System.out.println("Username "+ value +" is valid");
}else{
System.out.println("Username "+ value +" is invalid");
}
}
}
}
Output
Username Jai_singh is invalid
Username Jai@5 is invalid
Username jai12345 is valid
Username jai_singh is valid |
Username Jai_singh is invalid
Username Jai@5 is invalid
Username jai12345 is valid
Username jai_singh is valid
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