Remove html markup in rich text field

Question

I am trying to remove html markup (any html tags) from rich text field in tridion 2011 but somehow nothing is working for me. Is it achievable? If yes any examples would help me out. I tried below script and it is removing the content of the tags as well.

<xsl:template match="/">
  <xsl:apply-templates select="*"/>
 </xsl:template>

 <xsl:template match="*">
  <xsl:apply-templates select="node()"/>
 </xsl:template>
 <xsl:template match="text()">
  <xsl:value-of select="."/>
 </xsl:template>

Answer 1

I am trying to remove html markup (any html tags) from rich text field in tridion 2011

In the first place, if you are trying to remove all html tags then what is the use of being the field as "Rich Text".

Follow this way:

1. Add a text field (Example: ABC Field)
2. Set "Height of the Text Area" as 5 Rows

With these steps, field will allow only Text (If though content authors copy pasted from word).

Later stage, if you want to allow Rich Text content on the ABC Field then follow below steps:

1. Open the schema
2. Select ABC field
3. Under Field details, check the "Allow Rich Text Formatting" checkbox and select the "Accessibility Level"
4. Save & Close the schema

Now field will transform to Rich Text field and you can start adding Rich text content.

Answer 2

If it was a normal XSLT question, I would suggest you to use something like:

<template match="/">
    <value-of select="."/>
</template>

But unfortunately the Filtering XSLT seems to be called by something and not simply applied to the field. Using the above example would simply clean out all content of the field (at least that is what it does for me).

So the best thing I could come up with was to filter out all unwanted HTML tags, using something silly like this:

<stylesheet xmlns="http://www.w3.org/1999/XSL/Transform" version="1.0">
    <output omit-xml-declaration="yes" method="xml" cdata-section-elements="script"></output>
    <template match="/ | node()">
        <copy>
            <apply-templates select="node()"></apply-templates>
        </copy>
    </template>
    <template match="a | b | br | del | div | em | font | h1 | h2 | h3 | h4 | h5 | h6 | i | img | li | ol | p | strong | span | sup | table | td | th | tr | ul">
        <value-of select="."></value-of>
    </template>
</stylesheet>

Now this is no where near complete, it misses all kinds of HTML tags not even speaking of uppercase variants.

So I would have to conclude that the answer given by Siva is your best option.