Check the string only Alpha characters

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• How to check the value of a string is numeric, alphanumeric or characters?

  Hi all
  I have a task to validate an employee ID, assume that the employee Id is E121212. Now according to the validation rule, I need to check "the first letter of the employee Id is a character and rest are numbers." How can I do this? Please answer.
  
  
  
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  Hello

  You can opt for regexp_like in this case. See the code below

  with data as (
    select 'E121212' s from dual union all
    select '121212' from dual union all
    select 'EE121212' from dual union all
    select 'EE1212EE' from dual union all
    select 'É121212' s from dual
  )
  
  select
  *
  from data
  where
  regexp_like (s, '^[A-Z]\d+$')
  
  S
  E121212 
  

  ^ [A-Z] means that, at the beginnign (^), should be only between A - Z characters, uppercase. If you want to add lowercase letters, you can easily replace it [A-Za-z]. \d is a symbol for the numbers and + means it must complete at least one or more of her. $ means the end, so he stayed there until the end but nothig figures.

  If yoou want characters as allowed, you can change the character class to [: alpha:]

  select
  *
  from data
  where
  regexp_like (s, '^[[:alpha:]]\d+$')
  
  S
  E121212
  É121212 
  

  concerning

  Published by: chris227 on 26.07.2012 00:53
  fix

• check if a string contains only some characters

  I'm working on a java program that converts the Roman numbers. The user enters a string, and I need to check to make sure that it contains MDCLXVI and if he doesn't I will get them the input again string. I thought I'd do a while loop but I'm not sure if it's the smart way to make or the syntax to perform the check.
  
  Here was a thought on the control with a while loop, but I've never used it before and maybe build evil.

  while (!Pattern.matches("MDCLXVI", firstRoman))
          {
          System.out.print("Not a valid Roman Number please try again");
          firstRoman = firstRoman.toUpperCase();
          }

  My Code is as follows:
  

  // Ask for user to input firstRoman Number
          System.out.print("Enter your first Roman Number:");
          // add the Roman Number to the String variable
          firstRoman = keyboard.nextLine();
          firstRoman = firstRoman.toUpperCase();

  Once they enter in the it, I want to check to make sure that it has characters MDCLXVI and if it contains any other characters then I will provide a new object Scanner keyboard to try again and if it fails again, it will go to the option to try again until they put in a string that contains only the characters above. I don't know where to go here to get the while loop has worked. New to Java and I got my program work properly when I put good known numbers of novel, but I want to take incorrect entries.
  
  Any help would be appreciated.
  
  Thank you
  Wally
  
  I put the code for my main program and my class below just in case. I have already met the requirements of the teacher if the project is done, I'm just trying to improve.
  

  /*
   * To change this template, choose Tools | Templates
   * and open the template in the editor.
   */
  package myname.project.pkg6;
  
  import java.util.Scanner;
  import java.util.regex.Pattern;
  
  /**
   *
   * @author wsteadma
   */
  public class mynameProject6 {
  
      /**
       * @param args the command line arguments
       */
      public static void main(String[] args) {
          
          // Used for testing
          String firstRoman;
          String secondRoman;
          
          
          Scanner keyboard = new Scanner(System.in);
  
          
          // Ask for user to input firstRoman Number
          System.out.print("Enter your first Roman Number:");
          // add the Roman Number to the String variable
          firstRoman = keyboard.nextLine();
          firstRoman = firstRoman.toUpperCase();
          
                
          // Ask for user to input secondRoman Number
          System.out.print("Enter your second Roman Number:");
          // add the Roman Number to the String variable
          secondRoman = keyboard.nextLine(); // Add the name input into the name variable
          secondRoman = secondRoman.toUpperCase();
          
          
          //Creating first instance of Roman Numbers class
          Roman firstNumber = new Roman(firstRoman);
          Roman secondNumber = new Roman(secondRoman);
          
          System.out.println("Printout of the created roman numbers");
          //Prints out the Roman Number
          firstNumber.printRoman();
          secondNumber.printRoman();
          
          
          // Convert Roman to Decimal
          firstNumber.setDecimal(firstRoman);
          secondNumber.setDecimal(secondRoman);
          
          System.out.println("Viewing the Decimal values for the two defined instances");
          //Prints decimal Numbers
          firstNumber.printDecimal();  
          secondNumber.printDecimal();
          
          System.out.println("Adding the Roman Numbers and returning new Roman value");
          Roman romanAdd;
          romanAdd = firstNumber.addRoman(secondNumber);
          romanAdd.printRoman();
  
          System.out.println("Subtracting the Roman Numbers and return new Roman value");
          Roman romanSub;
          romanSub = firstNumber.subRoman(secondNumber);
          romanSub.printRoman();
      }
  }

  CLASS:

  /*
   * To change this template, choose Tools | Templates
   * and open the template in the editor.
   */
  package myname.project.pkg6;
  
  /**
   *
   * @author wsteadma
   */
  public class Roman {
  
      private String romNumber;
      private int decNumber;
  
      public Roman(String rNumber) {
          romNumber = rNumber;
      }
  
      public String getRoman() {
          return romNumber;
      }
      
      public int getDecimal()
      {
      return decNumber;
      }
  
      public void printRoman() {
          System.out.println("The Roman Number is " + romNumber);
      }
  
      public void printDecimal() {
          System.out.println("The Decimal Number is " + decNumber);
      }
  
      // Converts a roman number string into a decimal value
      public int setDecimal(String romNum) {
          int charValue = 0;
          char[] characters = new char[romNum.length()];
  
          //System.out.println("romNum length is " + romNum.length());
          for (int counter = 0; counter < romNum.length(); counter++) {
              characters[counter] = romNum.charAt(counter);
              //System.out.println(characters[counter]);
          }
  
          for (int sCounter = 0; sCounter < romNum.length(); sCounter++) {
              if (characters[sCounter] == 'M'  || characters[sCounter] == 'm') {
                  charValue += 1000;
              } else if (characters[sCounter] == 'D' || characters[sCounter] == 'd') {
                  charValue += 500;
              } else if (characters[sCounter] == 'C' || characters[sCounter] == 'c') {
                  charValue += 100;
              } else if (characters[sCounter] == 'L' || characters[sCounter] == 'l') {
                  charValue += 50;
              } else if (characters[sCounter] == 'X' || characters[sCounter] == 'x') {
                  charValue += 10;
              } else if (characters[sCounter] == 'V' || characters[sCounter] == 'v') {
                  charValue += 5;
              } else if (characters[sCounter] == 'I' || characters[sCounter] == 'i') {
                  charValue += 1;
              }
          
          }
          decNumber = charValue;
          return charValue;
      }
  
      // Converts a decomal number to a roman number
      public String setDec2Roman(int decNum) {
          String newRoman = "";
  
          while (decNum >= 1000) {
              newRoman += "M";
              decNum -= 1000;
              //System.out.println(decNum);
              //System.out.println(newRoman);
          }
  
          while (decNum >= 500) {
              newRoman += "D";
              decNum -= 500;
              //System.out.println(decNum);
              //System.out.println(newRoman);
          }
  
          while (decNum >= 100) {
              newRoman += "C";
              decNum -= 100;
              //System.out.println(decNum);
              //System.out.println(newRoman);
          }
  
          while (decNum >= 50) {
              newRoman += "L";
              decNum -= 50;
              //System.out.println(decNum);
              //System.out.println(newRoman);
          }
  
          while (decNum >= 10) {
              newRoman += "X";
              decNum -= 10;
              //System.out.println(decNum);
              //System.out.println(newRoman);
          }
  
          while (decNum >= 5) {
              newRoman += "V";
              decNum -= 5;
              //System.out.println(decNum);
              //System.out.println(newRoman);
          }
  
          while (decNum > 0) {
              newRoman += "I";
              decNum -= 1;
              //System.out.println(decNum);
              //System.out.println(newRoman);
          }
          return newRoman;
      }
  
      public Roman addRoman(Roman newRom) {
          int totRom = newRom.setDecimal(newRom.romNumber) + decNumber;
          romNumber = newRom.setDec2Roman(totRom);
          return new Roman(romNumber);
      }
      
      public Roman subRoman(Roman subRom) {
          int totRom = decNumber - subRom.setDecimal(subRom.romNumber);
          romNumber = subRom.setDec2Roman(totRom);
          return new Roman(romNumber);
      }
      
  }

  While (!.) Pattern.Matches ("MDCLXVI", firstRoman))

  Try "[MDCLXVI] *" and see if it's better

  {
  System.out.Print ("a valid Roman Number please try again");
  firstRoman = firstRoman.toUpperCase ();
  }

  My Code is as follows:

  // Ask for user to input firstRoman Number
  System.out.print("Enter your first Roman Number:");
  // add the Roman Number to the String variable
  firstRoman = keyboard.nextLine();
  firstRoman = firstRoman.toUpperCase();
  

  Once they enter in the it, I want to check to make sure that it has characters MDCLXVI and if it contains any other characters then I will provide a new object Scanner keyboard to try again and if it fails again, it will go to the option to try again until they put in a string that contains only the characters above. I don't know where to go here to get the while loop has worked. New to Java and I got my program work properly when I put good known numbers of novel, but I want to take incorrect entries.

  Any help would be appreciated.

  Thank you
  Wally

  I put the code for my main program and my class below just in case. I have already met the requirements of the teacher if the project is done, I'm just trying to improve.

  /*
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
  package myname.project.pkg6;
  
  import java.util.Scanner;
  import java.util.regex.Pattern;
  
  /**
  *
  * @author wsteadma
  */
  public class mynameProject6 {
  
  /**
  * @param args the command line arguments
  */
  public static void main(String[] args) {
  
  // Used for testing
  String firstRoman;
  String secondRoman;
  
  Scanner keyboard = new Scanner(System.in);
  
  // Ask for user to input firstRoman Number
  System.out.print("Enter your first Roman Number:");
  // add the Roman Number to the String variable
  firstRoman = keyboard.nextLine();
  firstRoman = firstRoman.toUpperCase();
  
  // Ask for user to input secondRoman Number
  System.out.print("Enter your second Roman Number:");
  // add the Roman Number to the String variable
  secondRoman = keyboard.nextLine(); // Add the name input into the name variable
  secondRoman = secondRoman.toUpperCase();
  
  //Creating first instance of Roman Numbers class
  Roman firstNumber = new Roman(firstRoman);
  Roman secondNumber = new Roman(secondRoman);
  
  System.out.println("Printout of the created roman numbers");
  //Prints out the Roman Number
  firstNumber.printRoman();
  secondNumber.printRoman();
  
  // Convert Roman to Decimal
  firstNumber.setDecimal(firstRoman);
  secondNumber.setDecimal(secondRoman);
  
  System.out.println("Viewing the Decimal values for the two defined instances");
  //Prints decimal Numbers
  firstNumber.printDecimal();
  secondNumber.printDecimal();
  
  System.out.println("Adding the Roman Numbers and returning new Roman value");
  Roman romanAdd;
  romanAdd = firstNumber.addRoman(secondNumber);
  romanAdd.printRoman();
  
  System.out.println("Subtracting the Roman Numbers and return new Roman value");
  Roman romanSub;
  romanSub = firstNumber.subRoman(secondNumber);
  romanSub.printRoman();
  }
  }
  

  CLASS:

  /*
  * To change this template, choose Tools | Templates
  * and open the template in the editor.
  */
  package myname.project.pkg6;
  
  /**
  *
  * @author wsteadma
  */
  public class Roman {
  
  private String romNumber;
  private int decNumber;
  
  public Roman(String rNumber) {
  romNumber = rNumber;
  }
  
  public String getRoman() {
  return romNumber;
  }
  
  public int getDecimal()
  {
  return decNumber;
  }
  
  public void printRoman() {
  System.out.println("The Roman Number is " + romNumber);
  }
  
  public void printDecimal() {
  System.out.println("The Decimal Number is " + decNumber);
  }
  
  // Converts a roman number string into a decimal value
  public int setDecimal(String romNum) {
  int charValue = 0;
  char[] characters = new char[romNum.length()];
  
  //System.out.println("romNum length is " + romNum.length());
  for (int counter = 0; counter < romNum.length(); counter++) {
  characters[counter] = romNum.charAt(counter);
  //System.out.println(characters[counter]);
  }
  
  for (int sCounter = 0; sCounter < romNum.length(); sCounter++) {
  if (characters[sCounter] == 'M'  || characters[sCounter] == 'm') {
  charValue += 1000;
  } else if (characters[sCounter] == 'D' || characters[sCounter] == 'd') {
  charValue += 500;
  } else if (characters[sCounter] == 'C' || characters[sCounter] == 'c') {
  charValue += 100;
  } else if (characters[sCounter] == 'L' || characters[sCounter] == 'l') {
  charValue += 50;
  } else if (characters[sCounter] == 'X' || characters[sCounter] == 'x') {
  charValue += 10;
  } else if (characters[sCounter] == 'V' || characters[sCounter] == 'v') {
  charValue += 5;
  } else if (characters[sCounter] == 'I' || characters[sCounter] == 'i') {
  charValue += 1;
  }
  
  }
  decNumber = charValue;
  return charValue;
  }
  
  // Converts a decomal number to a roman number
  public String setDec2Roman(int decNum) {
  String newRoman = "";
  
  while (decNum >= 1000) {
  newRoman += "M";
  decNum -= 1000;
  //System.out.println(decNum);
  //System.out.println(newRoman);
  }
  
  while (decNum >= 500) {
  newRoman += "D";
  decNum -= 500;
  //System.out.println(decNum);
  //System.out.println(newRoman);
  }
  
  while (decNum >= 100) {
  newRoman += "C";
  decNum -= 100;
  //System.out.println(decNum);
  //System.out.println(newRoman);
  }
  
  while (decNum >= 50) {
  newRoman += "L";
  decNum -= 50;
  //System.out.println(decNum);
  //System.out.println(newRoman);
  }
  
  while (decNum >= 10) {
  newRoman += "X";
  decNum -= 10;
  //System.out.println(decNum);
  //System.out.println(newRoman);
  }
  
  while (decNum >= 5) {
  newRoman += "V";
  decNum -= 5;
  //System.out.println(decNum);
  //System.out.println(newRoman);
  }
  
  while (decNum > 0) {
  newRoman += "I";
  decNum -= 1;
  //System.out.println(decNum);
  //System.out.println(newRoman);
  }
  return newRoman;
  }
  
  public Roman addRoman(Roman newRom) {
  int totRom = newRom.setDecimal(newRom.romNumber) + decNumber;
  romNumber = newRom.setDec2Roman(totRom);
  return new Roman(romNumber);
  }
  
  public Roman subRoman(Roman subRom) {
  int totRom = decNumber - subRom.setDecimal(subRom.romNumber);
  romNumber = subRom.setDec2Roman(totRom);
  return new Roman(romNumber);
  }
  
  }
  

• How to allow the user to enter only alpha numeric characters in the text field?

  Hello

  Is it possible to restrict the user to enter only alpha numeric characters in the textfiled?

  Thank you

  Starting from the version 4.7, I don't see any how useful filter adapted to your needs.  Then why don't you override keyChar() like this:

  EditField eField = new EditField("Enter letters and digits only: ", "") {
      protected boolean keyChar(char ch, int status, int time) {
          if (CharacterUtilities.isLetter(ch) || CharacterUtilities.isDigit(ch) || (ch == Characters.BACKSPACE)) {
              return super.keyChar(ch, status, time);
          }
          return true;
      }
  };
  

  I have not tested this code, but you can give it a shot...

  You can add a manipulation (or super.keyChar...) for Characters.ENTER and Characters.ESCAPE, as well as anything else you be useful, such as the comma and the period.

  Hope this helps,

  Arkady.

  Edit: added Characters.BACKSPACE - you want to change, not you?

• Function DEFINITION, remove the chain alpha characters

  I'm on 11g.
  
  I need to remove the alpha of a string characters, leaving only numbers, but I get unexpected results:
  SQL > SELECT TRANSLATE ('3N', 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', NULL) a FROM DUAL;
  A
  -
  
  I thought that this would leave 3 of the 3N, but it returns an empty string. For my application, the string "3N" could be any length, will contain only letters and numbers and letters will always come at the end, but there might be more than one letter
  VALID INPUT samples:
  4
  25
  11F
  361NG
  8ABC
  
  Is there a better way?

  You must give a valid replacement at least, and then the rest will be replaced with null as the address:

  SELECT TRANSLATE('3N', '1ABCDEFGHIJKLMNOPQRSTUVWXYZ', '1') a FROM DUAL;
  

  Published by: chris227 on 07.02.2013 08:37
  Sorry, I forgot the 1 in the second parameter