/* 判断是否为数字 */
public static boolean isNumeric(String str)
{
if(str == null || str.isEmpty()){
return false;
}
Pattern pattern = Pattern.compile("[0-9]*");
Matcher isNum = pattern.matcher(str);
if (!isNum.matches())
{
return false;
}
return true;
}
/* 判断是否为数字或字母 */
public static boolean isNumOrLetter(String str)
{
Pattern pattern = Pattern.compile("^[a-zA-Z0-9]+$");
Matcher isRight = pattern.matcher(str);
if (!isRight.matches())
{
return false;
}
return true;
}
/* 判断是否有字母 */
public static boolean isLetter(String str)
{
Pattern pattern = Pattern.compile(".*[a-zA-Z]+.*");
Matcher islett = pattern.matcher(str);
if (!islett.matches())
{
return false;
}
return true;
}
/* 判断是否为+号数字或字母 */
public static boolean isPlusNumOrLetter(String str)
{
Pattern pattern = Pattern.compile("^\\+?[a-zA-Z0-9]+$"); ///^\+?[0-9a-zA-Z]+$/
Matcher isRight = pattern.matcher(str);
if (!isRight.matches())
{
return false;
}
return true;
}
Java正则表达式判断
原文：http://blog.csdn.net/liu76xt/article/details/44622541
