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Re: How to split an RegEx into several lines for read
Subject: Re: How to split an RegEx into several lines for readability?
From: "Dimitre Novatchev" <dnovatchev@xxxxxxxxx>
Date: Sun, 29 Apr 2007 13:48:39 -0700
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Wow...
Thanks a lot David, Colin and Rashmi.
Cheers,
Dimitre
On 4/29/07, David Carlisle <davidc@xxxxxxxxx> wrote:
Colin has mentioned the x flag (which allows you to add ignored white
space, also, since you are using xsl:analyze-string, the regex is an
attribute value template so you can define the regexp parts separately
and drop them in using {}.
For example this monster regex that matches tags in hmlparse
regex="<(/?){$d:elem}\s*(({$d:attr})*)(/?)>|{$d:comment}|{$d:pi}|{$d:doctype}|{$d:cdata}|({$d:msif})">
the regex that match each type of markup are in separate variables for
readability, they are only used once, in this expression.
<xsl:variable name="d:attr"
select="'(\i\c*)\s*(=\s*("[^"]*"|''[^'']*''|\c+))?\s*'"/>
<xsl:variable name="d:elem"
select="'(\i\c*)'"/>
<xsl:variable name="d:comment"
select="'<!\-\-[^\-]*(\-[^\-]+)*\-\->'"/>
<xsl:variable name="d:pi"
select="'<\?\i\c*[^>]*>'"/>
<xsl:variable name="d:doctype"
select="'<!D[^\[<>]*(\[[^\]]*\])?>'"/>
<xsl:variable name="d:msif"
select="'<!\[(end)?if.*?\]>'"/>
<xsl:variable name="d:cdata"
select="'<!\[CDATA(.|\s)*\]\]>'"/>
David
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--
Cheers,
Dimitre Novatchev
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