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Re: xsl:analyze-string explanation needed

Subject: Re: xsl:analyze-string explanation needed
From: David Carlisle <davidc@xxxxxxxxx>
Date: Thu, 20 Jul 2006 14:30:46 +0100
Re:  xsl:analyze-string explanation needed
> Looking at it, I see the general form as:
> Compare the string to the regular expression.
> If there is a match, output something.
> If there is no match, output something else.


Compare the string to the regular expression.
find _each_ (non-overlapping) substring that matches the regexp.
this gives you a sequence of substrings that alternate
for each item in this sequence, execute the matching or non-matching
branch of the code.


> Given the input "3 minutes 57 seconds",

([0-9]+ minutes) matches just once so you get the sequence of strings

("3 minutes","57 seconds")

so execute xsl:matching-substring with . set to "3 minutes" 
producing 180
then execute xsl:non-matching-substring> with . set to "57 seconds"
producing 0

think of doing a regexp replace of a large text and changing all "white"
to "black"
analyze sequence splitsthe text up to a sequnce of strings, that are
alternately "white" or <the stuff betwwen matches>. Your two brances
would then output "black" in the matching case and do a copy-of in the
non matching case and the end result is all occurrences of white get
changed to black.


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