Regex pattern to read an Web.config - regex

Question

I need your valuable help, in reading a connection string value using regex -
Idea is to read the pattern using saltstack state file, and replace with VSTS variable.
Could you please help , how can I read the value ?
<?xml version="1.0" encoding="utf-8"?>
<!--
For more information on how to configure your ASP.NET application, please visit
http://go.microsoft.com/fwlink/?LinkId=301880
-->
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<connectionStrings>
<add name="DefaultConnection" connectionString="Data Source=(LocalDb)\v11.0;AttachDbFilename=|DataDirectory|\aspnet-WebApplication45-20140804053515.mdf;Initial Catalog=aspnet-WebApplication45-20140804053515;Integrated Security=True"
providerName="System.Data.SqlClient" />
</connectionStrings>
<system.web>
<authentication mode="None" />
<compilation debug="true" targetFramework="4.5.1" />
<httpRuntime targetFramework="4.5.1" />
</system.web>
<system.webServer>
<modules>
<remove name="FormsAuthenticationModule" />
</modules>
</system.webServer>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-5.1.0.0" newVersion="5.1.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Optimization"
</entityFramework>
</configuration>
Below is my salt state file :
Thanks,

Answer 1

I use a Powershell script to replace the values of the connection string in the web.config.
After I "catch" the connection string I run this code:
$dbServer = [regex]::Match($connection, '(?i)data source=([^;]+)').Groups[1].Value
$newConnection = $connection.Replace($dbServer+';', $newSqlServerName+';')
$dbName = [regex]::Match($connection, '(?i)initial catalog=([^;]+)').Groups[1].Value
$newConnection = $newConnection.Replace($dbName+';', $newDbName+';')
So the Regex is:
For Data Source: (?i)data source=([^;]+)
For Initial Catalog: (?i)initial catalog=([^;]+)
For User name: (?i)user id=([^;]+)
For Password: (?i)password=([^;]+)