Question

How can i check if a string include only characters (XSLT File)?

<xsl:variable name="IsValid1">
  <xsl:choose>
    <xsl:when test="string-length(//FirstName) &gt; 0 and string-length(//LastName) &gt; 0 and substring(//FirstName, 1, 3) != 'TST' and XXXX//FirtName only charactersXXXXX ">
    </xsl:when>
    <xsl:otherwise>
    </xsl:otherwise>
  </xsl:choose>
</xsl:variable>

Answer 1

In XPath 1.0 (XSLT 1.0) you can use contains(). In XPath 2.0 (XSLT 2.0) you use matches().

You may want for example check for alphabetic characters only (no numerics, no other signs, no spaces):

matches(//FirstName, '^[a-zA-Z]+$')

or alphanumeric,

matches(//FirstName, '^[a-zA-Z0-9]+$')