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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
Re:  How to split an RegEx into several lines for  read
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="&lt;(/?){$d:elem}\s*(({$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*(&quot;[^&quot;]*&quot;|''[^'']*''|\c+))?\s*'"/>

<xsl:variable name="d:elem"
  select="'(\i\c*)'"/>

<xsl:variable name="d:comment"
  select="'&lt;!\-\-[^\-]*(\-[^\-]+)*\-\->'"/>

<xsl:variable name="d:pi"
  select="'&lt;\?\i\c*[^>]*>'"/>

<xsl:variable name="d:doctype"
  select="'&lt;!D[^\[&lt;>]*(\[[^\]]*\])?>'"/>


<xsl:variable name="d:msif" select="'&lt;!\[(end)?if.*?\]>'"/>

<xsl:variable name="d:cdata"
  select="'&lt;!\[CDATA(.|\s)*\]\]>'"/>



David

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--
Cheers,
Dimitre Novatchev
---------------------------------------
Truly great madness cannot be achieved without significant intelligence.
---------------------------------------
To invent, you need a good imagination and a pile of junk
-------------------------------------
You've achieved success in your field when you don't know whether what
you're doing is work or play

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