在Android里面使用正则有性能隐患

public static int findKeyWordCount(String srcText, String keyword) {
    int count = 0;
    Pattern p = Pattern.compile(keyword);
    Matcher m = p.matcher(srcText);
    while (m.find()) {
        count++;
    }
    return count;
}    

public static int getSubCount(String str, String key) {  
    int count = 0;  
    int index = 0;  
    while ((index = str.indexOf(key, index)) != -1) {  
        index = index + key.length();  
        count++;  
    } 
    return count;
}