??????????????????????????CPU?????????????????С??????????????????????????????????

???????????????????????????????????jstack????????????????????????????regex????????????????????????

???????????????ж?????ClientFilter???????????????matcher.matches()??????????????????????????????????淶???????μ????????????????????????????????

???????????????????????******Deliver …??????????????????淶???.*.*.*.*.*.*.*Deliver????java??????￡????????

????“sssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss”????????????

????????????????????????????????????

???????????????java??????greedy??????? .*??????÷???????????????????.*.*.*.*D?????????????????????abcdefghijklmnopqrstuvwxyz0123456789????36?????????????????????????? ”?????????(Finite-State Machine)“

???????greedy??(??ο???java.util.regex.Pattern.Curly.match0(…)??????????possessive??lazy??????? + ?? ?)????????????????????(?????????·??)??????????????????????????(???????)????????????cmin?????(???? .* ???cmin?0)???????

????.*D?????????? testDdev?????Java????? .* ??? .{0?? MAX}(?????MAX?????2???????????????)????? .{0?? MAX} ??????????(java???????string?????????????????????????java.util.regex.Pattern.LastNode???)??

????testDev$

????RED: ?????????

?????????????java????? next.match(matcher?? i?? seq)

????testDev$

????RED: ?????????

????BLUE:???????

??????????? D ??????????????????

????testDev$

????RED: ?????????

????BLUE:???????

??????????? e ??????????????????????????? D?????????????????????

????testDev$

????RED: {0 MAX} ????????

????BLUE:???????

????GREEN: D ????????

????testDdev

????RED: ?????????

?????????????????(java.util.regex.Pattern.Curly.match0(…))??

??????????????????????????е????????????????? .*.*.*.*D ????????java?????Pattern.compile?????????????

????type=0???????????greedy????????????????4??curly????????C1-4?????????????C1?????

????abcdefghijklmnopqrstuvwxyz0123456789$

?????????????漸?????????????5??????????

????abcdefghijklmnopqrstuvwxyz0123456789$

?????????C1??????5?????????????????? ?? .*.*.*D ?????6789$???????????C2???????????

????abcdefghijklmnopqrstuvwxyz0123456789$

???????next.match(matcher?? i?? seq)?????????next.match(matcher?? i?? seq)??‘D’????????????????????????4?????????????

????abcdefghijklmnopqrstuvwxyz0123456789$

????????????? .*.*D ???? 789$ ??????????next???????????????￡?

????abcdefghijklmnopqrstuvwxyz0123456789$

?????????? .*.*D ?match 89$???? C2-4 ??????C1???????????????????е?飺

????abcdefghijklmnopqrstuvwxyz0123456789$

??????????????????????????Щ????match???

?????????????????????ж??????????????????????????????????????Щ????match???OK???????????????????ū???????顣

??????????????n(?????????)????????? m(????????Ч????? .* ????????)??????????????????????????????????

????1????m=1?????? 1;??m>1?????? + n

????2?????? i=1??n-1??????????????i ? m=m-1?? n=n-i ??1?????????е??????;

??????????????????????????????????????