repalce(old,new,max)
参数：
old：将被替换掉的字符
new：新字符串，拥有替换old字符串
max：替换次数不超过max次,可选参数
str = "this is string example....wow!!! this is really string";
print str.replace("is", "was");
print str.replace("is", "was", 3);
>>thwas was string example....wow!!! thwas was really string
>>thwas was string example....wow!!! thwas is really string
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