Question

在此之前，我已经用Google搜索了这个问题，我找到了解决方案（显然）。但我无法使其发挥作用。所以我的问题更多是＆＃34;为什么这是错误的...＆＃34; 比＆＃34;如何制作这个......＆＃34;

我写了这段代码：

SELECT
   ServerName          = @@SERVERNAME,
   LoginName           = AccessSummary.LoginName,
   LoginType           = CASE WHEN syslogins.isntuser = 1 THEN 'WINDOWS_LOGIN' WHEN syslogins.isntgroup = 1 THEN 'WINDOWS_GROUP' ELSE 'SQL_USER' END,
   DatabaseName        = DB_NAME(),
   SelectAccess        = MAX(AccessSummary.SelectAccess),
   InsertAccess        = MAX(AccessSummary.InsertAccess),
   UpdateAccess        = MAX(AccessSummary.UpdateAccess),
   DeleteAccess        = MAX(AccessSummary.DeleteAccess),
   DBOAccess           = MAX(AccessSummary.DBOAccess),
   SysadminAccess      = MAX(AccessSummary.SysadminAccess)
FROM
   (
       /* Get logins with permissions */
       SELECT
           LoginName           = sysDatabasePrincipal.name,
           SelectAccess        = CASE WHEN permission_name = 'SELECT' THEN 1 ELSE 0 END,
           InsertAccess        = CASE WHEN permission_name = 'INSERT' THEN 1 ELSE 0 END,
           UpdateAccess        = CASE WHEN permission_name = 'UPDATE' THEN 1 ELSE 0 END,
           DeleteAccess        = CASE WHEN permission_name = 'DELETE' THEN 1 ELSE 0 END,
           DBOAccess           = 0,
           SysadminAccess      = 0
       FROM sys.database_permissions AS sysDatabasePermission
       INNER JOIN sys.database_principals AS sysDatabasePrincipal
           ON sysDatabasePrincipal.principal_id = sysDatabasePermission.grantee_principal_id
       INNER JOIN sys.server_principals AS sysServerPrincipal
           ON sysServerPrincipal.sid = sysDatabasePrincipal.sid
       WHERE sysDatabasePermission.class_desc = 'OBJECT_OR_COLUMN'
           AND sysDatabasePrincipal.type_desc IN ('WINDOWS_LOGIN', 'WINDOWS_GROUP', 'SQL_USER')
           AND sysServerPrincipal.is_disabled = 0
       UNION ALL
       /* Get group members with permissions */
       SELECT
           LoginName           = sysDatabasePrincipalMember.name,
           SelectAccess        = CASE WHEN permission_name = 'SELECT' THEN 1 ELSE 0 END,
           InsertAccess        = CASE WHEN permission_name = 'INSERT' THEN 1 ELSE 0 END,
           UpdateAccess        = CASE WHEN permission_name = 'UPDATE' THEN 1 ELSE 0 END,
           DeleteAccess        = CASE WHEN permission_name = 'DELETE' THEN 1 ELSE 0 END,
           DBOAccess           = 0,
           SysadminAccess      = 0
       FROM sys.database_permissions AS sysDatabasePermission
       INNER JOIN sys.database_principals AS sysDatabasePrincipalRole
           ON sysDatabasePrincipalRole.principal_id = sysDatabasePermission.grantee_principal_id
       INNER JOIN sys.database_role_members AS sysDatabaseRoleMember
           ON sysDatabaseRoleMember.role_principal_id = sysDatabasePrincipalRole.principal_id
       INNER JOIN sys.database_principals AS sysDatabasePrincipalMember
           ON sysDatabasePrincipalMember.principal_id = sysDatabaseRoleMember.member_principal_id
       INNER JOIN sys.server_principals AS sysServerPrincipal
           ON sysServerPrincipal.sid = sysDatabasePrincipalMember.sid
       WHERE sysDatabasePermission.class_desc = 'OBJECT_OR_COLUMN'
           AND sysDatabasePrincipalRole.type_desc = 'DATABASE_ROLE'
           AND sysDatabasePrincipalRole.name <> 'public'
           AND sysDatabasePrincipalMember.type_desc IN ('WINDOWS_LOGIN', 'WINDOWS_GROUP', 'SQL_USER')
           AND sysServerPrincipal.is_disabled = 0
       UNION ALL
       /* Get users in db_owner, db_datareader and db_datawriter */
       SELECT
           LoginName           = sysServerPrincipal.name,
           SelectAccess        = CASE WHEN sysDatabasePrincipalRole.name IN ('db_owner', 'db_datareader') THEN 1 ELSE 0 END,
           InsertAccess        = CASE WHEN sysDatabasePrincipalRole.name IN ('db_owner', 'db_datawriter') THEN 1 ELSE 0 END,
           UpdateAccess        = CASE WHEN sysDatabasePrincipalRole.name IN ('db_owner', 'db_datawriter') THEN 1 ELSE 0 END,
           DeleteAccess        = CASE WHEN sysDatabasePrincipalRole.name IN ('db_owner', 'db_datawriter') THEN 1 ELSE 0 END,
           DBOAccess           = CASE WHEN sysDatabasePrincipalRole.name = 'db_owner' THEN 1 ELSE 0 END,
           SysadminAccess      = 0
       FROM sys.database_principals AS sysDatabasePrincipalRole
       INNER JOIN sys.database_role_members AS sysDatabaseRoleMember
           ON sysDatabaseRoleMember.role_principal_id = sysDatabasePrincipalRole.principal_id
       INNER JOIN sys.database_principals AS sysDatabasePrincipalMember
           ON sysDatabasePrincipalMember.principal_id = sysDatabaseRoleMember.member_principal_id
       INNER JOIN sys.server_principals AS sysServerPrincipal
           ON sysServerPrincipal.sid = sysDatabasePrincipalMember.sid
       WHERE sysDatabasePrincipalRole.name IN ('db_owner', 'db_datareader', 'db_datawriter')
           AND sysServerPrincipal.type_desc IN ('WINDOWS_LOGIN', 'WINDOWS_GROUP', 'SQL_LOGIN')
           AND sysServerPrincipal.is_disabled = 0
       UNION ALL
       /* Get users in sysadmin */
       SELECT
           LoginName           = sysServerPrincipalMember.name,
           SelectAccess        = 1,
           InsertAccess        = 1,
           UpdateAccess        = 1,
           DeleteAccess        = 1,
           DBOAccess           = 0,
           SysadminAccess      = 1
       FROM sys.server_principals AS sysServerPrincipalRole
       INNER JOIN sys.server_role_members AS sysServerRoleMember
           ON sysServerRoleMember.role_principal_id = sysServerPrincipalRole.principal_id
       INNER JOIN sys.server_principals AS sysServerPrincipalMember
           ON sysServerPrincipalMember.principal_id = sysServerRoleMember.member_principal_id
       WHERE sysServerPrincipalMember.type_desc IN ('WINDOWS_LOGIN', 'WINDOWS_GROUP', 'SQL_LOGIN')
           AND sysServerPrincipalMember.is_disabled = 0
   ) AS AccessSummary
INNER JOIN MASTER.dbo.syslogins AS syslogins
   ON syslogins.loginname = AccessSummary.LoginName
WHERE AccessSummary.LoginName NOT IN ('NT SERVICE\MSSQLSERVER', 'NT AUTHORITY\SYSTEM', 'NT SERVICE\SQLSERVERAGENT')
GROUP BY
   AccessSummary.LoginName,
   CASE WHEN syslogins.isntuser = 1 THEN 'WINDOWS_LOGIN' WHEN syslogins.isntgroup = 1 THEN 'WINDOWS_GROUP' ELSE 'SQL_USER' END

此代码尝试从任何字符串中删除private const string pattern = @"^[_L]{2}[0-9]{2}$"; public string RemoveL(string child) { Regex regex = new Regex(pattern); return regex.Replace("SUB_1_SC_0310_1_A_L01", ""); }。所以：

SUB_1_SC_0310_1_A_L01 - ＆gt; SUB_1_SC_0310_1_A

但它返回相同的字符串L_XX。

对我做错了什么的想法？

Answer 1

这是错误的，因为您使用了^$，这意味着启动＆amp;字符串的结尾。将您的正则表达式更改为[_L]{2}[0-9]{2}，它将有效。

请注意，您可以使用\d代替[0-9]而[_L]{2}将匹配_和L的任意组合，而不是_L

我会使用_L\d{2}。

似乎你想让第二个数字可选。您有几个选择：

_L\d\d?＆lt; = ?使第二个数字可选;
_L\d{1,2}＆lt; = {a,b}确保先前的模式从a到b次（包括在内）

Answer 2

正确的模式是

    private const string pattern = @"_L[0-9]{2}$";

请注意^缺席[_L]（字符串无需开始 {2}}和_L后"_L"（您只需_L - exactly _L [0-9]{2} - exactly 2 digits 0..9 $ - end of string 1}}，而不是{_，L}设置两次）。

说明：

"xxxxL_01"

如果您想要替换L（请注意_和private const string pattern = @"[_L]{2}[0-9]{2}$";订单），那么

   _L       - '_' and 'L' in any order (i.e. either _L or L_)
   [0-9]{2} - exactly 2 digits 0..9  
   $        - end of string

说明：

<input name="initials" type="text" ng-model="vm.initials" minlength="2" maxlength="4" ng-blur="vm.initials = vm.initials.toUpperCase()">

Answer 3

你的模式中的问题是字符'^'和'$'，它们匹配字符串的开头和结尾。如果删除它们，您的模式将匹配字符串_L01，例如，字符串中的任何位置。

所以你的模式应该是

private const string pattern = @"[_L]{2}[0-9]{2}";

此外，如果您使用[_L]，则表示该类的一个元素由字符'_'和'L'组成。它将与"_L"匹配，但也会与"__"，"L_"或"LL"匹配。如果您想要更具限制性并且只匹配“_L”，那么您的模式应该是

private const string pattern = @"_L[0-9]{2}";

如何使用Regex替换模式？

3 个答案: