将字母转换为数字A-Z转换为1-26

package com.nortl.namacngsg.util;

public class CommonUtil
{
	// 将字母转换为数字A-Z转换为1-26
	public static String letterToNum(String input)
	{
		String reg = "[a-zA-Z]";
		StringBuffer strBuf = new StringBuffer();
		input = input.toLowerCase();
		if (null != input && !"".equals(input))
		{
			for (char c : input.toCharArray())
			{
				if (String.valueOf(c).matches(reg))
				{
					strBuf.append(c - 96);
				} else
				{
					strBuf.append(c);
				}
			}
			return strBuf.toString();
		} else
		{
			return input;
		}
	}
}