String replace() and replaceAll() modify
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1.the parameters of replace are char and CharSequence,which can support this substribution of characters,and also support the substribution of strings ;
2.the parameters of replaceAll is the regex,which is based on the substribution of the rule expression,for example ,all numeric characters of a string can be replaced by the asterisk by replaceAll("\ \ ","*");
3.tips: in java "//"=="/",in regex "//"=="/" so when in java and regex "////"=="/"
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