Validate user input, Is it numeric and alphabet

Developer can check if the given string is an alphabet,Number or etc

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

import org.apache.log4j.Logger;


public class LoginFormValidations {
 private static Logger log = Logger.getLogger(LoginFormValidations.class);
 
 private static Pattern numberPattern = Pattern.compile("[0-9]+");
 private static Pattern alphabeticPattern = Pattern.compile("[a-zA-Z]+");
 private static Pattern alphaNumericPattern = Pattern.compile("[\x00-\x7F]+");
 
 /**Implementing method checks if the given string is a number or not
  * @param source
  * @return
  * 
  */
 public static boolean checkForNumbers(String source) 
 {
  boolean flag=true;
  try{
   Matcher numberMatcher = numberPattern.matcher(source);
   flag = numberMatcher.matches(); 
   log.debug("is Number flag="+flag);
  }catch(Exception e){
   log.debug("exception in checkForNumbers");
  }
  return flag;
 }
 
 /**Implementing method checks if the given string is an alphabet or not
  * @param source
  * @return
  * 
  */
 public static boolean checkForAlphabet(String source) 
 {
  boolean flag=true;
  try{
   Matcher numberMatcher = alphabeticPattern.matcher(source);
   flag = numberMatcher.matches(); 
  }catch(Exception e){
   log.debug("exception in checkForString");    
  }
  return flag;  
 }
 /**Implementing method checks if the given string is has ascii charecters or not
  * @param source
  * @return
  * 
  */
 public static boolean checkForAscii(String source) 
 {
  boolean flag=true;
  try{
   Matcher numberMatcher = alphaNumericPattern.matcher(source);
   flag = numberMatcher.matches();
   log.debug("Ascii="+flag);
  }catch(Exception e){
   log.debug("exception in checkForString");    
  }
  return flag;  
 }
 
 /**Implementing method checks if the given string is of email format
  * @param source
  * @return
  * 
  */
 public static boolean checkForEmail(String source) 
 {
       //Set the email pattern string
       Pattern p = Pattern.compile(".+@.+\.[a-z]+");

       //Match the given string with the pattern
       Matcher m = p.matcher(source);

       //check whether match is found 
       boolean matchFound = m.matches();

       if (matchFound)
         log.debug("Valid Email Id.");
       else
        log.debug("Invalid Email Id.");

              return matchFound;
 }
 
 
}