How to convert tags in all tags in xml to lowercase without changing case of atribute values?

Question

I\'ve inherited some xml files which has all tags in uppercase. I would like to convert them to lowercase using either a regular expression or via XSLT. It would be handy to be

Answer 1

By using PHP you can do it like this...

<?php

$pattern= '/<\\w+|<\/\\w+/';
$fp = fopen("/Applications/XAMPP/htdocs/test/test.xml", "r") or die("can't read stdin");
while (!feof($fp)) {
    $line = fgets($fp);
    $line = preg_replace_callback(
        $pattern,
        function ($matches) {
            return strtolower($matches[0]);
        },
        $line
    );
    echo htmlentities($line);
}
fclose($fp);
?>

It work fine ;)

Answer 2

try to this regex:

<(\/?[a-zA-Z]*)\b.*?>

online tester: http://regex101.com/#PCRE

Enjoy your code

Answer 3

You might need 2 regexes in my opinion - one to convert the tag name, and another to convert the variable number of attribute-value pairs.

Here is how I could do it -

blah:tmp shreyas$ cat old.xml | perl -pe "s|(</?)([^> ]+)(.*?>)|\1\L\2\E\3|g" | perl -pe "s|(\w+)( ?= ?\".*?\")|\L\1\E\2|g" > processed.xml
blah:tmp shreyas$ diff new.xml processed.xml 
4c4
<     <P>It would be remiss of me to neglect to thank the bottle.</P>
---
>     <p>It would be remiss of me to neglect to thank the bottle.</p>
9,10c9,10
<       <P>It seems a violent betrayal, me divulging how...</P>
<       <P>The years had not been kind Felix Lake. His constant...</P>
---
>       <p>It seems a violent betrayal, me divulging how...</p>
>       <p>The years had not been kind Felix Lake. His constant...</p>
15c15
<     <P>As luck would not have it, he did.</P>
---
>     <p>As luck would not have it, he did.</p>

old.xml is your Before xml and new.xml is your After xml. processed.xml is the one generated by the command.

As you can see, the P tags in your after xml are still capital. I am not sure if they were typos or exceptions. I trreated them as typos since you mentioned changing all tags to small case.

With a small modification, you could run these commands on all of you inherited set of XMLs, and get them converted quickly.

Answer 4

Try (untested):

XSLT 2.0:

<xsl:stylesheet version="2.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:strip-space elements="*"/>

<xsl:template match="*">
    <xsl:element name="{lower-case(local-name())}" namespace="{namespace-uri()}">
        <xsl:apply-templates select="@*|node()"/>
    </xsl:element>
</xsl:template>

<xsl:template match="@*">
    <xsl:attribute name="{lower-case(local-name())}" namespace="{namespace-uri()}">
        <xsl:value-of select="."/>
    </xsl:attribute>
</xsl:template>

<xsl:template match="comment() | text() | processing-instruction()">
    <xsl:copy/>
</xsl:template>

</xsl:stylesheet>

---

The XSLT 1.0 version of the above would go like this:

<xsl:stylesheet version="1.0" 
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:strip-space elements="*"/>

<xsl:variable name="uppercase" select="'ABCDEFGHIJKLMNOPQRSTUVWXYZ'" />
<xsl:variable name="lowercase" select="'abcdefghijklmnopqrstuvwxyz'" />

<xsl:template match="*">
    <xsl:element name="{translate(local-name(), $uppercase, $lowercase)}" namespace="{namespace-uri()}">
        <xsl:apply-templates select="@*|node()"/>
    </xsl:element>
</xsl:template>

<xsl:template match="@*">
    <xsl:attribute name="{translate(local-name(), $uppercase, $lowercase)}" namespace="{namespace-uri()}">
        <xsl:value-of select="."/>
    </xsl:attribute>
</xsl:template>

<xsl:template match="comment() | text() | processing-instruction()">
    <xsl:copy/>
</xsl:template>

</xsl:stylesheet>

However, this is assuming your element and attribute names do not contain upper-case characters other than the 26 explicitly listed (i.e. no Russian, Greek, diacritics, etc.).