regex101: PCRE (Legacy) Match Workspace

Regular Expression

<setting.*?>[\w\W]+?<\/setting>

New

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <section name="ICTRExchange.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowExeDefinition="MachineToLocalUser" requirePermission="false" />
    </sectionGroup>
  </configSections>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
  </startup>
  <userSettings>
    <ICTRExchange.Properties.Settings>
      <setting name="ServerIP" serializeAs="String">
        <value />
      </setting>
      <setting name="ServerPort" serializeAs="String">
        <value>0</value>
      </setting>

Extraction

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">
      <section name="ICTRExchange.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowExeDefinition="MachineToLocalUser" requirePermission="false" />
    </sectionGroup>
  </configSections>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
  </startup>
  <userSettings>
    <ICTRExchange.Properties.Settings>
      <setting name="ServerIP" serializeAs="String">
        <value />
      </setting>
      <setting name="ServerPort" serializeAs="String">
        <value>0</value>
      </setting>