Custom Web Publishing Guide

Developing FileMaker XSLT stylesheets 65
Comparing strings using Perl 5 regular expressions
You can use the fmxslt:regex_contains() extension function to compare strings using Perl 5 regular expressions.
A regular expression comparison is an advanced type of text matching that enables you to determine if a string
matches a specified pattern. The syntax of this function is:
fmxslt:regex_contains(String input, String pattern)
where input is a string and pattern is a Perl 5 regular expression. For more information on the syntax of Perl 5
regular expressions, see www.perldoc.com. The
fmxslt:regex_contains() function returns a boolean value.
This function is useful if you need more advanced string manipulation than is provided by standard XSLT. For
example, you can determine if a field value contains a valid telephone number or email address by comparing
the string against a Perl 5 regular expression.
Here is an example of using this function to determine if a field value contains email addresses that are
constructed correctly:
<xsl:variable name="email" select="'[e-mail]'"/>
<xsl:if test="fmxslt:regex_contains($email,'^\w+[\w-\.]*\@\w+((-\w+)|(\w*))\.[a-z]{2,3}$')">Valid Email</xsl:if>
If the Web Publishing Engine cannot parse the pattern, the error status is set to error code 10311. See “Error
code numbers for the FileMaker XSLT extension functions” on page 97.
Checking for values in a field formatted as a checkbox
You can use the following extension function to determine whether a particular value in a checkbox value list
is stored in a field in the FileMaker database:
fmxslt:contains_checkbox_value(String valueString, String valueListEntry)
where valuestring is an XPath specifying the field, and valueListEntry is the value you want to check for.
If the specified value is stored in the field, this boolean function returns true(). Otherwise, it returns false(). You
can use this function to determine whether to set the checked attribute in an HTML form to display a checkbox
as being selected.
For example, suppose a field in a FileMaker database layout has the following checkbox options:
[ ] Red
[ ] Blue
[ ] Green
[ ] Small
[ ] Medium
fmxslt:url_decode(String value, String
encoding)
string Returns a URL-decoded string using the character
encoding you specify for the encoding parameter, which
can be: US-ASCII, ISO-8859-1, ISO-8859-15, ISO-
2022-JP, Shift_JIS or UTF-8.
Use this function in situations where you must specify
the character encoding used in a URL encoded string in
order to decode the string properly. For example, even
though your web site uses ISO-8859-1, users might
submit a form using a different character encoding.
String manipulation
extension function
Data type
returned Description