Java 语言有个简单的正则不会写了... - V2EX
JavaFirstMaster

Java 语言有个简单的正则不会写了...

  •  
  •   JavaFirstMaster Jan 6, 2020 2183 views
    This topic created in 2329 days ago, the information mentioned may be changed or developed.
    public class SimpleTest { @Test public void test() { String s = "https://www.baidu.comhttp://abc.com/abc.jpg"; Matcher matcher = Pattern.compile("https?://.+").matcher(s); while (matcher.find()) { System.out.println(matcher.group()); } } } 

    如上代码, 我想把字符串分割成两个正确的 url, 可是上面的正则始终是"贪婪模式", 一下子匹配到整个字符串.

    如果正则写成 https?://.+?, 又只会匹配到如下结果:

    • https://w
    • http://a

    有没有帅气堪比吴彦祖的朋友解答一下我的疑惑呀

    4 replies    2020-01-06 17:16:42 +08:00
    iyaozhen
        1
    iyaozhen  
       Jan 6, 2020   1


    https?:\/\/.+?(?=http|$)

    有个非常拗口的翻译:零宽断言 https://deerchao.cn/tutorials/regex/regex.htm#lookaround
    JavaFirstMaster
        2
    JavaFirstMaster  
    OP
       Jan 6, 2020
    @iyaozhen 非常正确!

    我之前想到这个了, 不过差了一点, 我写的是 `https?://.+(?=https?://|$)`, 外部的 `.+` 后面没有指定非贪婪模式!

    谢谢吴彦祖!!
    optional
        3
    optional  
       Jan 6, 2020
    这个需求直接 split( http)似乎更好啊。
    JavaFirstMaster
        4
    JavaFirstMaster  
    OP
       Jan 6, 2020
    @optional 字符串中包含的网址数量不定, 而且 http 或者 https 位置也不确定, 所以 split 的话比较麻烦
    About     Help     Advertise     Blog     API     FAQ     Solana     2381 Online   Highest 6679       Select Language
    创意工作者们的社区
    World is powered by solitude
    VERSION: 3.9.8.5 31ms UTC 01:03 PVG 09:03 LAX 18:03 JFK 21:03
    Do have faith in what you're doing.
    ubao msn snddm index pchome yahoo rakuten mypaper meadowduck bidyahoo youbao zxmzxm asda bnvcg cvbfg dfscv mmhjk xxddc yybgb zznbn ccubao uaitu acv GXCV ET GDG YH FG BCVB FJFH CBRE CBC GDG ET54 WRWR RWER WREW WRWER RWER SDG EW SF DSFSF fbbs ubao fhd dfg ewr dg df ewwr ewwr et ruyut utut dfg fgd gdfgt etg dfgt dfgd ert4 gd fgg wr 235 wer3 we vsdf sdf gdf ert xcv sdf rwer hfd dfg cvb rwf afb dfh jgh bmn lgh rty gfds cxv xcv xcs vdas fdf fgd cv sdf tert sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf sdf shasha9178 shasha9178 shasha9178 shasha9178 shasha9178 liflif2 liflif2 liflif2 liflif2 liflif2 liblib3 liblib3 liblib3 liblib3 liblib3 zhazha444 zhazha444 zhazha444 zhazha444 zhazha444 dende5 dende denden denden2 denden21 fenfen9 fenf619 fen619 fenfe9 fe619 sdf sdf sdf sdf sdf zhazh90 zhazh0 zhaa50 zha90 zh590 zho zhoz zhozh zhozho zhozho2 lislis lls95 lili95 lils5 liss9 sdf0ty987 sdft876 sdft9876 sdf09876 sd0t9876 sdf0ty98 sdf0976 sdf0ty986 sdf0ty96 sdf0t76 sdf0876 df0ty98 sf0t876 sd0ty76 sdy76 sdf76 sdf0t76 sdf0ty9 sdf0ty98 sdf0ty987 sdf0ty98 sdf6676 sdf876 sd876 sd876 sdf6 sdf6 sdf9876 sdf0t sdf06 sdf0ty9776 sdf0ty9776 sdf0ty76 sdf8876 sdf0t sd6 sdf06 s688876 sd688 sdf86