mTools/isValid.java at master · thankvn/mTools · GitHub

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import android.app.Application;
import android.text.TextUtils;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class CheckIsValid extends Application {

    public boolean isValidEmail(String email) {

    	if (TextUtils.isEmpty(email)) {

    		return false;

    	} else {

    		return android.util.Patterns.EMAIL_ADDRESS.matcher(email).matches();
    	}
    }

    public boolean isValidLogin(String login) {

        String regExpn = "^([a-zA-Z]{4,24})?([a-zA-Z][a-zA-Z0-9_]{4,24})$";
        CharSequence inputStr = login;
        Pattern pattern = Pattern.compile(regExpn, Pattern.CASE_INSENSITIVE);
        Matcher matcher = pattern.matcher(inputStr);

        if (matcher.matches()) {

            return true;

        } else {

            return false;
        }
    }

    public boolean isValidSearchQuery(String query) {

        String regExpn = "^([a-zA-Z]{1,24})?([a-zA-Z][a-zA-Z0-9_]{1,24})$";
        CharSequence inputStr = query;
        Pattern pattern = Pattern.compile(regExpn, Pattern.CASE_INSENSITIVE);
        Matcher matcher = pattern.matcher(inputStr);

        if (matcher.matches()) {

            return true;

        } else {

            return false;
        }
    }

    public boolean isValidPassword(String password) {

        String regExpn = "^[a-z0-9_]{6,24}$";
        CharSequence inputStr = password;
        Pattern pattern = Pattern.compile(regExpn, Pattern.CASE_INSENSITIVE);
        Matcher matcher = pattern.matcher(inputStr);

        if (matcher.matches()) {

            return true;

        } else {

            return false;
        }
    }
}