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copied!<p>There aren't any regular expressions in XSLT 1.0, so I'm afraid that pattern matching isn't going to be possible.</p> <p>I'm not clear if <code><srcTime>23:00</srcTime></code> is supposed to be legal or not? If it is, try:</p> <pre><code><dstTime> <xsl:if test="string-length(srcTime) = 4 or string-length(srcTime) = 5"> <xsl:variable name="hour" select="substring(srcTime, 1, 2)" /> <xsl:if test="$hour >= 0 and 24 > $hour"> <xsl:variable name="minute"> <xsl:choose> <xsl:when test="string-length(srcTime) = 5 and substring(srcTime, 3, 1) = ':'"> <xsl:value-of select="substring(srcTime, 4, 2)" /> </xsl:when> <xsl:when test="string-length(srcTime) = 4"> <xsl:value-of select="substring(srcTime, 3, 2)" /> </xsl:when> </xsl:choose> </xsl:variable> <xsl:if test="$minute >= 0 and 60 > $minute"> <xsl:value-of select="concat($hour, ':', $minute)" /> </xsl:if> </xsl:if> </xsl:if> </dstTime> </code></pre> <p>If it isn't, and four digits is the only thing that's legal then:</p> <pre><code><dstTime> <xsl:if test="string-length(srcTime) = 4"> <xsl:variable name="hour" select="substring(srcTime, 1, 2)" /> <xsl:if test="$hour >= 0 and 24 > $hour"> <xsl:variable name="minute" select="substring(srcTime, 3, 2)" /> <xsl:if test="$minute >= 0 and 60 > $minute"> <xsl:value-of select="concat($hour, ':', $minute)" /> </xsl:if> </xsl:if> </xsl:if> </dstTime> </code></pre>

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