RE: How to filter characters from a string?

Write a translate that removes all the characters that are allowed in
base64. The result of this translate is a string containing all the
characters that aren't allowed, i.e. the ones you want to remove. Use this
as the second parameter for another translate():

translate($x, translate($x, 'ABCDE...abcde...12345...', ''), '')

Michael Kay
Software AG
home: Michael.H.Kay@xxxxxxxxxxxx
work: Michael.Kay@xxxxxxxxxxxxxx

> -----Original Message-----
> From: owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> [mailto:owner-xsl-list@xxxxxxxxxxxxxxxxxxxxxx]On Behalf Of Greg Faron
> Sent: 28 March 2002 19:10
> To: XSL-List@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  How to filter characters from a string?
>
>
> Hi all,
>
>    I'm practicing XSLT and decided to write my own Base 64
> encoder and
> decoder templates.  The rules for Base 64 Encoding say that only the
> following characters (in an encoded file) should be examined
> upon decoding:
> <xsl:variable name="base64Map"
> select="'ABCDEFGHIJKLMNOPQRSTUVWXYZabcedfghijklmnopqrstuvwxyz0
> 1234567890+/='"/>
>
>    This means that I would like to filter out every character
> that is not
> one of the 65 above characters.  I realize that I could do
> this partially
> with translate(), but then I would need to specify every
> possible illegal
> character, of which there are thousands (if you have Unicode
> characters in
> there).  A smaller version of such a command would be
> translate($encodedString,
>            $base64Map,
>            concat($base64Map,
>                   '=&#xA;&#xD;
> `~!@#$%^&amp;*()-_)&quot;&apos;[]{}|\&lt;&gt;,.?;:'))
>
>    Are there any templates or commands to delete any
> character from the
> first argument that DOESN'T appear in the second argument?  I'm using
> Microsoft XSLT engine MSXSL4.
>
>
> Greg Faron
> Integre Technical Publishing Co.
>
>
>
>  XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list
>


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