正则表达式-查找与另一个标记值一起出现的XML标记

Question

Let's say I have XML: <Customer><CustomerType>Business</CustomerType><CreditRating>Good</CreditRating></Customer> <Customer><CustomerType>Residential</CustomerType><CreditRating>Good</CreditRating></Customer>

and I want to change all the Credit Ratings for the Residential consumers from Good to Bad.

What regex search term can I use to find (and therefore replace) the CreditRating tag only when this occurs within a customer record with a residential Customer Type?

I know I can use: <Customer>.*?<CustomerType>Residential.*?</Customer> to match a whole record Residential customer record but I only want to match the CreditRating tag within the Customer Record so I can do a search and replace.

Thanks a lot,

:-)

Answer 1

This is easy (and safe) in XSLT...

XML Input (wrapped in <Customers> to be well-formed)

<Customers>
    <Customer>
        <CustomerType>Business</CustomerType>
        <CreditRating>Good</CreditRating>
    </Customer>
    <Customer>
        <CustomerType>Residential</CustomerType>
        <CreditRating>Good</CreditRating>
    </Customer>
</Customers>

XSLT 1.0

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output indent="yes"/>
    <xsl:strip-space elements="*"/>

    <xsl:template match="@*|node()">
        <xsl:copy>
            <xsl:apply-templates select="@*|node()"/>
        </xsl:copy>
    </xsl:template>

    <xsl:template match="Customer[CustomerType='Residential']/CreditRating">
        <CreditRating>Bad</CreditRating>
    </xsl:template>

</xsl:stylesheet>

Output XML

<Customers>
   <Customer>
      <CustomerType>Business</CustomerType>
      <CreditRating>Good</CreditRating>
   </Customer>
   <Customer>
      <CustomerType>Residential</CustomerType>
      <CreditRating>Bad</CreditRating>
   </Customer>
</Customers>