String replaceAll
https://www.javaworld.com.tw/jute/post/view?bid=29&id=148126&sty=1&tpg=4&age=-1 https://zhidao.baidu.com/question/1366968178357934659.html http://www.cnblogs.com/iyangyuan/p/4809582.html http://www.runoob.com/regexp/regexp-syntax.html http://ccckmit.wikidot.com/regularexpression