<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
	<xsl:output method="text" indent="yes" omit-xml-declaration="yes"/>
	
	<xsl:template name="mainTemplate">
		<xsl:variable name="testString">Testing "123 first quoted string"
and then "second quoted string" and another "third quoted
string".</xsl:variable>

		<!-- ("[^"]*") -->
		<xsl:analyze-string select="$testString" regex='("[^"]*")'>
			<xsl:matching-substring>
				<xsl:value-of select="regex-group(1)"/>
			</xsl:matching-substring>
			<!--
			<xsl:non-matching-substring>
				<xsl:value-of select="."/>
			</xsl:non-matching-substring>	
			-->
		</xsl:analyze-string>

	</xsl:template>
	
</xsl:stylesheet>