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    copied!<p><strong>I. You may do something like this in XSLT 2.0</strong>:</p> <pre><code>&lt;xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:output omit-xml-declaration="yes" indent="yes"/&gt; &lt;xsl:template match="s"&gt; &lt;xsl:variable name="vWords" select= "tokenize(lower-case(string(.)), '[\s.?!,;—:\-]+' ) [.] "/&gt; &lt;xsl:sequence select= " for $current in ., $i in 1 to count($vWords) return if($vWords[$i] eq 'blood' and $vWords[$i+1] eq 'pressure' ) then . else () "/&gt; &lt;/xsl:template&gt; &lt;xsl:template match="text()"/&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p><strong>When this XSLT 2.0 transformation is applied to the following XML document</strong> (no such document provided in the question!!!):</p> <pre><code>&lt;t&gt; &lt;s&gt;He has high blood pressure.&lt;/s&gt; &lt;s&gt;He has high Blood Pressure.&lt;/s&gt; &lt;s&gt;He has high Blood Pressure.&lt;/s&gt; &lt;s&gt;He was coldblood Pressured.&lt;/s&gt; &lt;/t&gt; </code></pre> <p><strong>the wanted, correct result</strong> (only elements containing `"blood" and "pressure" (case-insensitive and as two adjacent words) <strong>is produced</strong>:</p> <pre><code>&lt;s&gt;He has high blood pressure.&lt;/s&gt; &lt;s&gt;He has high Blood Pressure.&lt;/s&gt; &lt;s&gt;He has high Blood Pressure.&lt;/s&gt; </code></pre> <p><strong>Explanation</strong>:</p> <ol> <li><p>Using the <code>tokenize()</code> function to split on strings of nn-letter characters, with flags for case-insensitivity and multi-line mode.</p></li> <li><p>Iterating through the result of <code>tokenize()</code> to find a <code>"blood"</code> word followed immediately by a <code>"pressure"</code> word.</p></li> </ol> <hr> <p><strong>II. An XSLT 1.0 solution</strong>:</p> <pre><code>&lt;xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"&gt; &lt;xsl:output omit-xml-declaration="yes" indent="yes"/&gt; &lt;xsl:strip-space elements="*"/&gt; &lt;xsl:variable name="vUpper" select= "'ABCDEFGHIJKLMNOPQRSTUVWXYZ'"/&gt; &lt;xsl:variable name="vLower" select= "'abcdefghijklmnopqrstuvwxyz'"/&gt; &lt;xsl:variable name="vSpaaaceeees" select= "' ' "/&gt; &lt;xsl:variable name="vAlpha" select="concat($vLower, $vUpper)"/&gt; &lt;xsl:template match="s"&gt; &lt;xsl:variable name="vallLower" select="translate(., $vUpper, $vLower)"/&gt; &lt;xsl:copy-of select= "self::* [contains (concat (' ', normalize-space (translate($vallLower, translate($vallLower, $vAlpha, ''), $vSpaaaceeees)), ' ' ), ' blood pressure ' ) ] "/&gt; &lt;/xsl:template&gt; &lt;xsl:template match="text()"/&gt; &lt;/xsl:stylesheet&gt; </code></pre> <p><strong>when this transformation is applied on the same XML document (above), the same correst result is produced</strong>:</p> <pre><code>&lt;s&gt;He has high blood pressure.&lt;/s&gt; &lt;s&gt;He has high Blood Pressure.&lt;/s&gt; &lt;s&gt;He has high Blood Pressure.&lt;/s&gt; </code></pre> <p><strong>Explanation</strong>:</p> <ol> <li><p>Converting to lowercase. </p></li> <li><p>Using the <em>double-translate</em> method to replace any non-alpha character to a space.</p></li> <li><p>Then using <code>normalize-space()</code> to replace any group of adjacent spaces with a single space.</p></li> <li><p>Then surrounding this result with spaces.</p></li> <li><p>Finally, verifying if the current result contains the string <code>" blood pressure "</code>.</p></li> </ol>
 

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