Java determines whether the string contains letters

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/**  
     * 该方法主要使用正则表达式来判断字符串中是否包含字母  
     * @author fenggaopan 2015年7月21日 上午9:49:40  
     * @param cardNum 待检验的原始卡号  
     * @return 返回是否包含  
     */  
    public boolean judgeContainsStr(String cardNum) {  
        String regex=".*[a-zA-Z]+.*";  
        Matcher m=Pattern.compile(regex).matcher(cardNum);  
        return m.matches();  
    } 
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