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Page History: Regular Expressions in SQL Server

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Page Revision: Thu, Apr 08, 2010, 9:14 AM

Overview¶

The dbo.RegExSearch function will allow you to use regular expressions within T-SQL code.

Sample Usage¶

The following SQL will extract the ZIP code from the specified sentence.

select ZipCode = dbo.RegExSearch(
     'My ZIP code is 30303, which is in Atlanta, Georgia.'
    ,'(?<zip>[0-9]{5})'
    ,'zip'
    )

Source Code¶

VB.NET¶

{copytext|SourceVb}

Imports System
Imports System.Data
Imports System.Data.SqlClient
Imports System.Data.SqlTypes
Imports Microsoft.SqlServer.Server
Imports System.Text.RegularExpressions

Partial Public Class UserDefinedFunctions
    <Microsoft.SqlServer.Server.SqlFunction()> _
    Public Shared Function RegExSearch(ByVal searchIn As SqlString, ByVal pattern As SqlString, _
    ByVal groupName As SqlString) As SqlString

        Dim result As String = ""
        Dim regex As Regex = New Regex(pattern.Value)
        Dim mc As MatchCollection = regex.Matches(searchIn.Value)

        If mc IsNot Nothing _
        AndAlso mc.Count > 0 _
        AndAlso mc(0).Groups.Count > 0 _
        AndAlso mc(0).Groups(groupName.Value) IsNot Nothing Then

            result = mc(0).Groups(groupName.Value).Value

        End If

        Return New SqlString(result)

    End Function
End Class

C#¶

{copytext|SourceCs}

TODO

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