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Ruby 正则表达式 (regex) : character appear only once at most

假设我想确保一个字符串x等于abcd的任意组合(每个字符出现一次或零次-->每个字符不应重复,但该组合可以以任何顺序出现)有效的例子:bc..abcd...bcad...b...d..dc无效的例子。abcdd、cc、bbbb、abcde(当然)我的努力:我尝试了各种技术:我最接近的是x=~^(((a)?(b)?(c)?(d)?))$但是如果我不按照我写的顺序输入它们,这将无法工作:适用于:ab、acd、abcd、a、d、c不适用于:bcda、cb、da(任何不在上述顺序中的)您可以在这里测试您的解决方案:http://rubular.com/r/wCpD355bubPS:字符可能不按

【云原生】docker-compose安装,解决Warning: the “docker“ command appears to already exist on this system.3的问题

1.对应版本https://docs.docker.com/compose/compose-file/compose-file-v3/参考:https://github.com/docker/compose/releases2.安装国内源安装(不推荐):curl-Lhttp://get.daocloud.io/docker/compose/releases/download/v2.2.3/docker-compose-`uname-s`-`uname-m`>/usr/local/bin/docker-composesudochmod+x/usr/local/bin/docker-compose

【云原生】docker-compose安装,解决Warning: the “docker“ command appears to already exist on this system.3的问题

1.对应版本https://docs.docker.com/compose/compose-file/compose-file-v3/参考:https://github.com/docker/compose/releases2.安装国内源安装(不推荐):curl-Lhttp://get.daocloud.io/docker/compose/releases/download/v2.2.3/docker-compose-`uname-s`-`uname-m`>/usr/local/bin/docker-composesudochmod+x/usr/local/bin/docker-compose

Huawei's Newly-launched HarmonyOS 3.0 Appears to Be Less Like a Fork of Android

OnJuly27,2022,HuaweiannouncedtolaunchtheHarmonyOS3.0.AsaresponsetoU.S.regulatoryrestrictions,Huawei'sHarmonyOSalsomakesitmorelikelythatwewillseemoreChineseoperatingsystemsonthemarketofsmartdevicesinthefuture.Inthepastfewyears,HarmonyOShasbeensubjecttocontroversyoverwhetheritissimplyaforkofAndroid.Wi

Huawei's Newly-launched HarmonyOS 3.0 Appears to Be Less Like a Fork of Android

OnJuly27,2022,HuaweiannouncedtolaunchtheHarmonyOS3.0.AsaresponsetoU.S.regulatoryrestrictions,Huawei'sHarmonyOSalsomakesitmorelikelythatwewillseemoreChineseoperatingsystemsonthemarketofsmartdevicesinthefuture.Inthepastfewyears,HarmonyOShasbeensubjecttocontroversyoverwhetheritissimplyaforkofAndroid.Wi

Git出现 fatal: ‘origin‘ does not appear to be a git repository fatal: Could not read from remote的解决方法

目录1.问题所示2.原理分析3.解决方法3.1断开连接3.2连接错误1.问题所示刚开始学习git或者步入公司的时候对git的一些基本操作或者错误还不会处理可能会出现如下问题:gitpushoriginmasterfatal:'origin'doesnotappeartobeagitrepositoryfatal:Couldnotreadfromremoterepository.Pleasemakesureyouhavethecorrectaccessrightsandtherepositoryexists.截图如下:2.原理分析gitadd以及commit命令都可,就是push上传的时候出现了

Git出现 fatal: ‘origin‘ does not appear to be a git repository fatal: Could not read from remote的解决方法

目录1.问题所示2.原理分析3.解决方法3.1断开连接3.2连接错误1.问题所示刚开始学习git或者步入公司的时候对git的一些基本操作或者错误还不会处理可能会出现如下问题:gitpushoriginmasterfatal:'origin'doesnotappeartobeagitrepositoryfatal:Couldnotreadfromremoterepository.Pleasemakesureyouhavethecorrectaccessrightsandtherepositoryexists.截图如下:2.原理分析gitadd以及commit命令都可,就是push上传的时候出现了