创建程序集 ClrRegExClass.cs,
并使用 C:\Windows\Microsoft.NET\Framework\v2.0.50727\csc.exe /target:library ClrRegExClass.cs 编译为 ClrRegExClass.DLL 文件。using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using Microsoft.SqlServer.Server;
using System.Text.RegularExpressions;public partial class RegExp
{
// 验证字符串中是否包含与指定的匹配模式一致的字符串
[SqlFunction(IsDeterministic = true, IsPrecise = true)]
public static SqlBoolean RegExIsMatch(SqlString expression, SqlString pattern)
{
return new SqlBoolean(Regex.IsMatch(expression.ToString(), pattern.ToString()));
}// 替换字符串中与指定的匹配模式一致的字符串
[SqlFunction(IsDeterministic = true, IsPrecise = true)]
public static SqlString RegExReplace(SqlString expression, SqlString pattern, SqlString replacement)
{
return new SqlString(Regex.Replace(expression.ToString(), pattern.ToString(), replacement.ToString()));
}// 提取字符串中与指定的匹配模式一致的字符串
[SqlFunction(IsDeterministic = true, IsPrecise = true)]
public static SqlString RegExSubstring(SqlString expression, SqlString pattern, SqlInt32 position, SqlInt32 occurrence)
{
if (expression.ToString().Length < position) return new SqlString("");
if (position <= 0) position = 1;
if (occurrence <= 0) occurrence = 1; Match m = Regex.Match(expression.ToString().Substring((int) position - 1),pattern.ToString());
for (int i = 1; i < (int)occurrence; i++)
{
m = m.NextMatch();
if (!m.Success) return new SqlString("");
} return new SqlString(m.ToString());
}// 计算字符串中与指定的匹配模式一致的字符串的数目
[SqlFunction(IsDeterministic = true, IsPrecise = true)]
public static SqlInt32 RegExCount(SqlString expression, SqlString pattern, SqlInt32 position)
{
if (expression.ToString().Length < position) return 0;
if (position <= 0) position = 1; MatchCollection ms = Regex.Matches(expression.ToString().Substring((int)position - 1), pattern.ToString()); return new SqlInt32(ms.Count);
}// 查找字符串中与指定的匹配模式一致的字符串的位置
[SqlFunction(IsDeterministic = true, IsPrecise = true)]
public static SqlInt32 RegExIndex(SqlString expression, SqlString pattern, SqlInt32 position, SqlInt32 occurrence)
{
if (expression.ToString().Length < position) return 0;
if (position <= 0) position = 1;
if (occurrence <= 0) occurrence = 1; Match m = Regex.Match(expression.ToString().Substring((int)position - 1), pattern.ToString());
for (int i = 1; i < (int)occurrence; i++)
{
m = m.NextMatch();
if (!m.Success) return 0;
} return new SqlInt32(m.Index + 1);
}
}
将程序集 ClrRegExClass.DLL 导入 SQL Server,并创建相应的函数。// 启用 SQL Server 的 CLR 支持
exec sp_configure 'clr enabled',1;
go
reconfigure
go// 导入程序集
if exists (select * from sys.assemblies where name='RegExp')
drop assembly RegExp;
go
create assembly RegExp authorization dbo
from 'fullpath\ClrRegExClass.dll'
with permission_set=safe;
go// 创建函数
// @expression 为输入的字符串;@pattern 为正则表达式;
// @position 为字符串开始的位置;@occurrence 为与指定的匹配模式一致的字符串出现的次数if object_id('dbo.regex_ismatch','FS') is not null
drop function dbo.regex_ismatch;
go
create function dbo.regex_ismatch
(@expression nvarchar(max), @pattern nvarchar(max))
returns bit with returns null on null input
as external name RegExp.RegExp.RegExIsMatch;
go-- 验证字符串是否以 [server] 开头
-- select dbo.regex_ismatch('[server].[database].[schema].[object]','^\[server\]');if object_id('dbo.regex_replace','FS') is not null
drop function dbo.regex_replace;
go
create function dbo.regex_replace
(@expression nvarchar(max), @pattern nvarchar(max), @replacement nvarchar(max))
returns nvarchar(max) with returns null on null input
as external name RegExp.RegExp.RegExReplace;
go-- 将字符串中 [...] 替换为 "..."
-- select dbo.regex_replace('[server].[database].[schema].[object]','\[([\w]*)\]','"$1"');if object_id('dbo.regex_substring','FS') is not null
drop function dbo.regex_substring;
go
create function dbo.regex_substring
(@expression nvarchar(max), @pattern nvarchar(max), @position int, @occurrence int)
returns nvarchar(max) with returns null on null input
as external name RegExp.RegExp.RegExSubstring;
go-- 提取字符串中与 [...] 模式匹配的第二次出现的字符串
-- select dbo.regex_substring('[server].[database].[schema].[object]','\[\w*\]',1,2);if object_id('dbo.regex_count','FS') is not null
drop function dbo.regex_count;
go
create function dbo.regex_count
(@expression nvarchar(max), @pattern nvarchar(max), @position int)
returns int with returns null on null input
as external name RegExp.RegExp.RegExCount;
go-- 计算字符串中与 [...] 模式匹配的字符串的数目
-- select dbo.regex_count('[server].[database].[schema].[object]','\[\w*\]',1);if object_id('dbo.regex_index','FS') is not null
drop function dbo.regex_index;
go
create function dbo.regex_index
(@expression nvarchar(max), @pattern nvarchar(max), @position int, @occurrence int)
returns int with returns null on null input
as external name RegExp.RegExp.RegExIndex;
go-- 查询字符串中与 [...] 模式匹配的第二次出现的字符串开始的位置
-- select dbo.regex_index('[server].[database].[schema].[object]','\[\w*\]',1,2);
(希望大家指正)
并使用 C:\Windows\Microsoft.NET\Framework\v2.0.50727\csc.exe /target:library ClrRegExClass.cs 编译为 ClrRegExClass.DLL 文件。using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using Microsoft.SqlServer.Server;
using System.Text.RegularExpressions;public partial class RegExp
{
// 验证字符串中是否包含与指定的匹配模式一致的字符串
[SqlFunction(IsDeterministic = true, IsPrecise = true)]
public static SqlBoolean RegExIsMatch(SqlString expression, SqlString pattern)
{
return new SqlBoolean(Regex.IsMatch(expression.ToString(), pattern.ToString()));
}// 替换字符串中与指定的匹配模式一致的字符串
[SqlFunction(IsDeterministic = true, IsPrecise = true)]
public static SqlString RegExReplace(SqlString expression, SqlString pattern, SqlString replacement)
{
return new SqlString(Regex.Replace(expression.ToString(), pattern.ToString(), replacement.ToString()));
}// 提取字符串中与指定的匹配模式一致的字符串
[SqlFunction(IsDeterministic = true, IsPrecise = true)]
public static SqlString RegExSubstring(SqlString expression, SqlString pattern, SqlInt32 position, SqlInt32 occurrence)
{
if (expression.ToString().Length < position) return new SqlString("");
if (position <= 0) position = 1;
if (occurrence <= 0) occurrence = 1; Match m = Regex.Match(expression.ToString().Substring((int) position - 1),pattern.ToString());
for (int i = 1; i < (int)occurrence; i++)
{
m = m.NextMatch();
if (!m.Success) return new SqlString("");
} return new SqlString(m.ToString());
}// 计算字符串中与指定的匹配模式一致的字符串的数目
[SqlFunction(IsDeterministic = true, IsPrecise = true)]
public static SqlInt32 RegExCount(SqlString expression, SqlString pattern, SqlInt32 position)
{
if (expression.ToString().Length < position) return 0;
if (position <= 0) position = 1; MatchCollection ms = Regex.Matches(expression.ToString().Substring((int)position - 1), pattern.ToString()); return new SqlInt32(ms.Count);
}// 查找字符串中与指定的匹配模式一致的字符串的位置
[SqlFunction(IsDeterministic = true, IsPrecise = true)]
public static SqlInt32 RegExIndex(SqlString expression, SqlString pattern, SqlInt32 position, SqlInt32 occurrence)
{
if (expression.ToString().Length < position) return 0;
if (position <= 0) position = 1;
if (occurrence <= 0) occurrence = 1; Match m = Regex.Match(expression.ToString().Substring((int)position - 1), pattern.ToString());
for (int i = 1; i < (int)occurrence; i++)
{
m = m.NextMatch();
if (!m.Success) return 0;
} return new SqlInt32(m.Index + 1);
}
}
将程序集 ClrRegExClass.DLL 导入 SQL Server,并创建相应的函数。// 启用 SQL Server 的 CLR 支持
exec sp_configure 'clr enabled',1;
go
reconfigure
go// 导入程序集
if exists (select * from sys.assemblies where name='RegExp')
drop assembly RegExp;
go
create assembly RegExp authorization dbo
from 'fullpath\ClrRegExClass.dll'
with permission_set=safe;
go// 创建函数
// @expression 为输入的字符串;@pattern 为正则表达式;
// @position 为字符串开始的位置;@occurrence 为与指定的匹配模式一致的字符串出现的次数if object_id('dbo.regex_ismatch','FS') is not null
drop function dbo.regex_ismatch;
go
create function dbo.regex_ismatch
(@expression nvarchar(max), @pattern nvarchar(max))
returns bit with returns null on null input
as external name RegExp.RegExp.RegExIsMatch;
go-- 验证字符串是否以 [server] 开头
-- select dbo.regex_ismatch('[server].[database].[schema].[object]','^\[server\]');if object_id('dbo.regex_replace','FS') is not null
drop function dbo.regex_replace;
go
create function dbo.regex_replace
(@expression nvarchar(max), @pattern nvarchar(max), @replacement nvarchar(max))
returns nvarchar(max) with returns null on null input
as external name RegExp.RegExp.RegExReplace;
go-- 将字符串中 [...] 替换为 "..."
-- select dbo.regex_replace('[server].[database].[schema].[object]','\[([\w]*)\]','"$1"');if object_id('dbo.regex_substring','FS') is not null
drop function dbo.regex_substring;
go
create function dbo.regex_substring
(@expression nvarchar(max), @pattern nvarchar(max), @position int, @occurrence int)
returns nvarchar(max) with returns null on null input
as external name RegExp.RegExp.RegExSubstring;
go-- 提取字符串中与 [...] 模式匹配的第二次出现的字符串
-- select dbo.regex_substring('[server].[database].[schema].[object]','\[\w*\]',1,2);if object_id('dbo.regex_count','FS') is not null
drop function dbo.regex_count;
go
create function dbo.regex_count
(@expression nvarchar(max), @pattern nvarchar(max), @position int)
returns int with returns null on null input
as external name RegExp.RegExp.RegExCount;
go-- 计算字符串中与 [...] 模式匹配的字符串的数目
-- select dbo.regex_count('[server].[database].[schema].[object]','\[\w*\]',1);if object_id('dbo.regex_index','FS') is not null
drop function dbo.regex_index;
go
create function dbo.regex_index
(@expression nvarchar(max), @pattern nvarchar(max), @position int, @occurrence int)
returns int with returns null on null input
as external name RegExp.RegExp.RegExIndex;
go-- 查询字符串中与 [...] 模式匹配的第二次出现的字符串开始的位置
-- select dbo.regex_index('[server].[database].[schema].[object]','\[\w*\]',1,2);
(希望大家指正)
太多了。
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using Microsoft.SqlServer.Server;
using System.Text.RegularExpressions;
using System.Collections;
using System.Diagnostics.CodeAnalysis;public static partial class UserDefinedFunctions
{
public static readonly RegexOptions Options =
RegexOptions.IgnorePatternWhitespace |
RegexOptions.Singleline; [SqlFunction]
public static SqlBoolean RegexMatch(
SqlChars input, SqlString pattern)
{
Regex regex = new Regex( pattern.Value, Options );
return regex.IsMatch( new string( input.Value ) );
} [SqlFunction]
public static SqlChars RegexGroup(
SqlChars input, SqlString pattern, SqlString name)
{
Regex regex = new Regex(pattern.Value, Options);
Match match = regex.Match(new string(input.Value));
return match.Success ?
new SqlChars(match.Groups[name.Value].Value) : SqlChars.Null;
} internal class MatchNode
{
private int _index;
public int Index { get { return _index; } } private string _value;
public string Value { get { return _value; } } public MatchNode(int index, string value)
{
_index = index;
_value = value;
}
} internal class MatchIterator : IEnumerable
{
private Regex _regex;
private string _input; public MatchIterator(string input, string pattern)
{
_regex = new Regex(pattern, UserDefinedFunctions.Options);
_input = input;
} public IEnumerator GetEnumerator()
{
int index = 0;
Match current = null;
do
{
current = (current == null) ?
_regex.Match(_input) : current.NextMatch();
if (current.Success)
{
yield return new MatchNode(++index, current.Value);
}
}
while (current.Success);
}
} [SqlFunction(FillRowMethodName = "FillMatchRow",
TableDefinition = "[Index] int,[Text] nvarchar(max)")]
public static IEnumerable RegexMatches(SqlChars input, SqlString pattern)
{
return new MatchIterator(new string(input.Value), pattern.Value);
} [SuppressMessage("Microsoft.Design", "CA1021:AvoidOutParameters")]
public static void FillMatchRow(object data,
out SqlInt32 index, out SqlChars text)
{
MatchNode node = (MatchNode)data;
index = new SqlInt32(node.Index);
text = new SqlChars(node.Value.ToCharArray());
} internal class GroupNode
{
private int _index;
public int Index { get { return _index; } } private string _name;
public string Name { get { return _name; } } private string _value;
public string Value { get { return _value; } } public GroupNode(int index, string group, string value)
{
_index = index;
_name = group;
_value = value;
}
} internal class GroupIterator : IEnumerable
{
private Regex _regex;
private string _input; public GroupIterator(string input, string pattern)
{
_regex = new Regex(pattern, UserDefinedFunctions.Options);
_input = input;
} public IEnumerator GetEnumerator()
{
int index = 0;
Match current = null;
string[] names = _regex.GetGroupNames();
do
{
index++;
current = (current == null) ?
_regex.Match(_input) : current.NextMatch();
if (current.Success)
{
foreach (string name in names)
{
Group group = current.Groups[name];
if (group.Success)
{
yield return new GroupNode(
index, name, group.Value);
}
}
}
}
while (current.Success);
}
} [SqlFunction(FillRowMethodName = "FillGroupRow", TableDefinition =
"[Index] int,[Group] nvarchar(max),[Text] nvarchar(max)")]
public static IEnumerable
RegexGroups(SqlChars input, SqlString pattern)
{
return new GroupIterator(new string(input.Value), pattern.Value);
} [SuppressMessage("Microsoft.Design", "CA1021:AvoidOutParameters")]
public static void FillGroupRow(object data,
out SqlInt32 index, out SqlChars group, out SqlChars text)
{
GroupNode node = (GroupNode)data;
index = new SqlInt32(node.Index);
group = new SqlChars(node.Name.ToCharArray());
text = new SqlChars(node.Value.ToCharArray());
}
}
2039748,Nancy Davolio,N
0798124,Andrew Fuller,M
4027392,Robert King,L'set @pattern = N'(?<CustomerNumber>\d{7}),
(?<CustomerName>[^,]*),(?<CustomerType>[A-Z])\r?\n'select
f.[CustomerNumber],
f.[CustomerName],
f.[CustomerType]
from dbo.RegExGroups( @file, @pattern ) regex
pivot
(
max([Text])
for [Group]
in ( [CustomerNumber], [CustomerName], [CustomerType] )
) as f