xsl:analyze-string
Applies a regular expression to a supplied string value.
Category: instruction
Content: (
xsl:matching-substring?
, xsl:non-matching-substring?
, xsl:fallback*
)
Permitted parent elements:
any XSLT element whose content model is
sequence-constructor; any literal result element
Attributes
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XPath expression whose value is the string to be analyzed. |
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The regular expression, which may be given as an attribute value template. |
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One or more Perl-like flags to control the
way in which regular expression matching is performed, for example the value
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Notes on the Saxon implementation
XSLT 3.0 removes the restriction that the regular expression must not be one that matches a zero-length string, so this is now allowed since Saxon 9.6.
Saxon allows the flags attribute to contain ";j" or ";n" at the end, to indicate that the Java or .NET regular expression engine should be used in preference to Saxon's own regular expression engine. When this option is used, the rules for regular expressions will be the rules from Java or .NET, rather than the XPath-defined rules.
Details
The xsl:analyze-string element applies a regular expression to a
supplied string value. The string is split into a sequence of substrings, each
of which is classified as either a matching substring (if it matches the regular
expression) or a non-matching substring (if it doesn't). The substrings are then
processed individually: the matching substrings by a xsl:matching-substring element that appears
as a child of the xsl:analyze-string instruction, the non-matching
substrings by a similar xsl:non-matching-substring element. If
either of these is omitted, the relevant substrings are not processed.
When processing matching substrings, it is possible to call the
regex-group() function to find the parts of the matching
substring that matched particular parenthesized groups within the regular
expression.
Examples
Examples of this element can be found in the XSLT 3.0 Specification.