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RE: How to filter characters from a string?
- From: "Michael Kay" <michael dot h dot kay at ntlworld dot com>
- To: <xsl-list at lists dot mulberrytech dot com>
- Date: Fri, 29 Mar 2002 21:11:07 -0000
- Subject: RE: [xsl] How to filter characters from a string?
- Reply-to: xsl-list at lists dot mulberrytech dot com
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@ntlworld.com
work: Michael.Kay@softwareag.com
> -----Original Message-----
> From: owner-xsl-list@lists.mulberrytech.com
> [mailto:owner-xsl-list@lists.mulberrytech.com]On Behalf Of Greg Faron
> Sent: 28 March 2002 19:10
> To: XSL-List@lists.mulberrytech.com
> Subject: [xsl] 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,
> '=

> `~!@#$%^&*()-_)"'[]{}|\<>,.?;:'))
>
> 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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