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Re: Regular expression functions (Was: Re: comments on December F&O draft)
> From some JScript documentation:
jscript> w'assat:-) sed's the thing (or emacs lisp:-)
> I agree with your analysis about regexp replace in general, though
> it's not altogether useless - when global, at least it goes some way
> towards helping with the classic multi-string-replacement problem. For
> example, to escape newline characters with "\n", tabs with "\t" and
> carriage returns with "\r":
but usually replace threads go
1) how to I replace a by b
2) to which you give a recursive template answer
3) then the original responder comes back and says
4) oh yes but actually I also want to replace b by c and d by the chunk of
XML that's in file abc.xml....
If you're going go add regexp support I don't think two functions and a
paragraph of text in F&O is enough. "If a job's worth doing it's worth
doing well" as my mum always said (not that I ever believed her:-)
> I think that you need a sequence of match positions *and lengths* in
ah yes well emacs match position data has beginning and end positions,
but beginnings and lengths would do:-)
> how do you define the scope, for one thing?
they'd be template-local variables
<xsl:apply-regexp-templates-to-string select="text()"/>
...
<xsl:regexp-template match="\sqrt{([^{}]*)}">
<msqrt>
<xsl:apply-regexp-templates-to-string select="$1"/>
</msqrt>
</xsl:regexp-template>
<xsl:regexp-template match="\gamma">
<mi>γ</mi>
</xsl:regexp-template>
....
\gamma + \sqrt{\gamma}
goes in
<mi>γ</mi> + <msqrt><mi>γ</mi></msqrt>
comes out (a first approximation to a tex->mathml conversion)
David
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