Re: [xsl] Complex Regex takes 201 steps in regex buddy but runs forever in Analyze-String

[Wolfgang Laun <wolfgang.laun@xxxxxxxxx>]

The parentheses '(' and ')' do not match well in <xsl:variable
name="CompleteListIdentificationRegex" >. Please check.

But one evil subpattern is this (with spaces inserted for readability):

   ( ( B+[^B;B$]+B; | \s+  |  B'[^B'B$]+B'  ){0,255})

This will try many combinations of zero to 255 repetitions of "any
number > 0 of spaces"

Cleaner is
    (\s+|( B+[^B;B$]+B;|B'[^B'B$]+B'){0,255})

-W

On 31 January 2011 19:40, Alex Muir <alex.g.muir@xxxxxxxxx> wrote:
> Hi,
>
> With the following code:
> ------------------------------
>
> <?xml version="1.0"?>
> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
> B xmlns:saxon="http://saxon.sf.net/";
xmlns:xs="http://www.w3.org/2001/XMLSchema";
> B version="2.0" B exclude-result-prefixes="#all">
> B <xsl:output method="xml" indent="no"/>
>
>
> B <xsl:template match="unknown[exists(text())]">
> B  B <xsl:copy>
> B  B  B <xsl:copy-of select="@*"/>
>
> B  B  B <xsl:call-template name="CompleteListAnalyze">
> B  B  B  B <xsl:with-param name="content" select="text()"/>
> B  B  B </xsl:call-template>
>
> B  B </xsl:copy>
> B </xsl:template>
>
>
> B <xsl:template name="CompleteListAnalyze">
> B  B <xsl:param name="content"/>
>
> B  B <xsl:variable name="CompleteListIdentificationRegex" >
> B  B 
B <xsl:text>((B$LISTITEM[^B$]+B$[^B$]+B$/LISTITEMB$)(((B+[^B;B$]+B;|\s+|B'[^B
'B$]+B'){0,255})(B$LISTITEM[^B$]+B$[^B$]+B$/LISTITEMB$)){0,200})</xsl:text>
> B  B </xsl:variable>
>
> B  B <xsl:analyze-string select="$content"
> regex="{$CompleteListIdentificationRegex}">
> B  B  B <xsl:matching-substring>
> B  B  B  B <xsl:text>B$COMPLETELIST POSITION="</xsl:text>
> B  B  B  B <xsl:value-of select="position()"/>
> B  B  B  B <xsl:text>" PLACEMENT=""B$</xsl:text>
> B  B  B  B <xsl:value-of select="regex-group(1)"/>
> B  B  B  B <xsl:text>B$b
/COMPLETELISTB$</xsl:text>
> B  B  B </xsl:matching-substring>
> B  B  B <xsl:non-matching-substring>
> B  B  B  B <xsl:value-of select="."/>
> B  B  B </xsl:non-matching-substring>
> B  B </xsl:analyze-string>
> B </xsl:template>
>
> </xsl:stylesheet>
>
>
> And the following input file:
> ----------------------------------
>
> <?xml version="1.0" encoding="UTF-8"?>
> <doc>
> B  B <unknown>B$LISTITEM BULLET="15" TITLE="TEXT TEXT TEXT TEXT"
> TYPE="SNLI"B$B+B'HLB'FONT size="2"
id="H13211"B;15B+/B'HLB'FONTB;B+/B'HLB'TDB;
> B  B+B'HLB'TD id="H13213"B;B+/B'HLB'TDB; B+/B'HLB'TRB; B+B'HLB'TR
id="H13215"B;B+B'HLB'TD
> id="H13216"B; B+/B'HLB'TDB;B+/B'HLB'TRB; B+B'HLB'TR valign="bottom"
id="H13218"B;
> B  B  B B+B'HLB'TD id="H13220"B;B+/B'HLB'TDB; B  B  B  B  B+B'HLB'TD
colspan="2"
> id="H13222"B;B+B'HLB'FONT size="2" id="H13223"B;TEXT TEXT TEXT
> TEXTB+/B'HLB'FONTB;B$/LISTITEMB$B+/TDB; B  B  B  B  B+TD
id="H13225"B;B+/TDB;
> B+TD id="H13227"B;B+/TDB; B  B  B  B  B+TD id="H13229"B;B+/TDB; B  B  B  B 
B+TD
> id="H13231"B;B+/TDB; B  B  B  B  B+TD align="right" id="H13233"B;B$LISTITEM
> BULLET="16" TITLE="TEXT TEXT TEXT TEXT" TYPE="SNLI"B$B+B'HLB'FONT size="2"
> id="H13234"B;16B+/B'HLB'FONTB;B+/B'HLB'TDB; B  B  B  B  B+B'HLB'TD
> id="H13236"B;B+/B'HLB'TDB; B+/B'HLB'TRB; B+B'HLB'TR id="H13238"B;B+B'HLB'TD
> id="H13239"B; B+/B'HLB'TDB;B+/B'HLB'TRB; B+B'HLB'TR valign="bottom"
id="H13241"B;
> B  B  B B+B'HLB'TD id="H13243"B;B+/B'HLB'TDB; B  B  B  B  B+B'HLB'TD
colspan="2"
> id="H13245"B;B+B'HLB'FONT size="2" id="H13246"B;TEXT TEXT TEXT TEXT TEXT
> B+/B'HLB'FONTB;B$/LISTITEMB$B+/TDB; B  B  B  B  B+TD id="H13248"B;B+/TDB; B 
B  B  B  B+TD
> id="H13250"B;B+/TDB; B  B  B  B  B+TD id="H13252"B;B+/TDB; B  B  B  B  B+TD
> id="H13254"B;B+/TDB; B  B  B  B  B+TD align="right" id="H13256"B;B$LISTITEM
> BULLET="17" TITLE="TEXT TEXT TEXT TEXT" TYPE="SNLI"B$B+B'HLB'FONT size="2"
> id="H13257"B;17B+/B'HLB'FONTB;B+/B'HLB'TDB; B  B  B  B  B+B'HLB'TD
> id="H13259"B;B+/B'HLB'TDB; B+/B'HLB'TRB; B+B'HLB'TR id="H13261"B;B+B'HLB'TD
> id="H13262"B; B+/B'HLB'TDB;B+/B'HLB'TRB; B+B'HLB'TR valign="bottom"
id="H13264"B;
> B  B  B B+B'HLB'TD id="H13266"B;B+/B'HLB'TDB; B  B  B  B  B+B'HLB'TD
colspan="2"
> id="H13268"B;B+B'HLB'FONT size="2" id="H13269"B;TEXT TEXT TEXT TEXT TEXT
> B+/B'HLB'FONTB;B$/LISTITEMB$</unknown>
> </doc>
>
> The regex held in the variable CompleteListIdentificationRegex runs
> fine on the same input executing to completion in 201 steps. It
> essentially just identifies all the content within the above <unknown>
> element.
>
> However the equivalent Analyze-String running in oxygen 12.1 will
> continue running and not stop on the same input.
>
> Any ideas?
>
> Been working on it for 4 hours without much progress other than
> reducing the number of execution steps in regex buddy by 40.
>
> Thanks Much
>
>
> --
> Alex
> -----
> Currently:
> Freelance Software Engineer 6+ yrs exp
>
> Previously:
> https://sites.google.com/a/utg.edu.gm/alex/
>
>
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