Bug with regex in Saxon xslt - Nesterovsky bros

Thursday, 13 September 2018

It seems we've found discrepancy in regex implementation during the transformation in Saxon. Consider the following xslt:

<xsl:stylesheet version="3.0" 
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:xs="http://www.w3.org/2001/XMLSchema">

  <xsl:template match="/">
    <xsl:variable name="text" as="xs:string" 
      select="'A = &quot;a&quot; OR B = &quot;b&quot;'"/>

    <xsl:analyze-string regex="&quot;(\\&quot;|.)*?&quot;" select="$text">
      <xsl:matching-substring>
        <xsl:message>
          <xsl:sequence select="regex-group(0)"/>
        </xsl:message>
      </xsl:matching-substring>
    </xsl:analyze-string>
  </xsl:template>

</xsl:stylesheet>

vs javascript

<html>
<body>
  <script>
    var text = 'A = "a" OR B = "b"';
    var regex = /"(\\"|.)*?"/;
    var match = text.match(regex);

    alert(match[0]);
  </script>
</body>
</html>

xslt produces: "a" OR B = "b"

while javascript: "a"

What is interesting is that we're certain this was working correctly in Saxon several years ago.

You can track progress of the bug at: https://saxonica.plan.io/boards/3/topics/7300 and at https://saxonica.plan.io/issues/3902.

Thursday, 13 September 2018 06:29:05 UTC

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