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<h1>22. Virtuoso Functions Guide - URLREWRITE_CREATE_REGEX_RULE</h1>
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<div id="text">
<h2>URLREWRITE_CREATE_REGEX_RULE</h2>
<div class="refpurpose">Creates regex rules.</div>
<div class="funcsynopsis">
<span class="funcdef">
<span class="function">URLREWRITE_CREATE_REGEX_RULE</span>
</span>
(<span class="paramdef">in <span class="parameter">rule_iri</span> varchar</span>,
<span class="paramdef">in <span class="parameter">allow_update</span> integer</span>,
<span class="paramdef">in <span class="parameter">nice_match</span> varchar</span>,
<span class="paramdef">in <span class="parameter">nice_params</span> any</span>,
<span class="paramdef">in <span class="parameter">nice_min_params</span> integer</span>,
<span class="paramdef">in <span class="parameter">target_compose</span> varchar</span>,
<span class="paramdef">in <span class="parameter">target_params</span> any</span>,
<span class="paramdef">in <span class="parameter">target_expn</span> varchar</span>,
<span class="paramdef">in <span class="parameter">accept_pattern</span> varchar</span>,
<span class="paramdef">in <span class="parameter">do_not_continue</span> integer</span>,
<span class="paramdef">in <span class="parameter">http_redirect_code</span> integer</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>Creates regex rules.</p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">rule_iri – </span>
The rule's name / identifier
</div>
<div class="refsect2">
<span class="refsect2title">allow_update – </span>
Indicates whether the rule can be updated. 1 indicates yes; 0 indicates no. The update is subject to the following rules:
If the given rule_iri is already in use as a rule list identifier, an error is signaled.
If the given rule_iri is already in use as a rule identifier and allow_update for the existing rule is zero, an error is signalled.
If the given rule_iri is already in use as a rule identifier and allow_update for the existing rule is non-zero, the existing rule is updated.
</div>
<div class="refsect2">
<span class="refsect2title">nice_match – </span>
A regex match expression to parse the URL into a vector of occurrences.
</div>
<div class="refsect2">
<span class="refsect2title">nice_params – </span>
A vector of the names of the parsed parameters. The length of the vector should be equal to the number of '(...)' specifiers in the format string.
</div>
<div class="refsect2">
<span class="refsect2title">nice_min_params – </span>
Used to specify the minimum number of sprintf format patterns to be matched in order to trigger the given rule. In existing versions of Virtuoso it only affects sprintf rules and has no effect for regex rules.
</div>
<div class="refsect2">
<span class="refsect2title">target_compose – </span>
A regex compose expression for the URL of the destination page.
</div>
<div class="refsect2">
<span class="refsect2title">target_params – </span>
A vector of names of parameters that should be passed to the compose expression (target_compose) as $1, $2 and so on.
Special names can be used in addition to names from <span class="computeroutput">nice_params</span>. That names start and end with asterisk.
Name '*accept*' is for required MIME type string, other names of the sort refer to values from HTTP request header lines.
Note that '*Accept*' will return the whole "Accept:" line whereas '*accept*' is for the part that matches <span class="computeroutput">accept_pattern</span>.
</div>
<div class="refsect2">
<span class="refsect2title">target_expn – </span>
Optional SQL text that should be executed instead of a regex compose call.
</div>
<div class="refsect2">
<span class="refsect2title">accept_pattern – </span>
A regex expression to match the HTTP Accept header
</div>
<div class="refsect2">
<span class="refsect2title">do_not_continue – </span>
If the given rule satisfies the match conditions, 1 signifies do not try the next rule from same rule list, and 0 signifies try the next rule.
</div>
<div class="refsect2">
<span class="refsect2title">http_redirect_code – </span>
NULL or the integer values 301, 302, 303, or 406, are currently allowed. If a 3xx redirect code is given, an HTTP redirect response will be sent back to client. If NULL is specified, the server will process the redirect internally.
</div>
</div>
<div class="refsect1">
<div class="refsect1title">Return Types</div>
<p>The return value is not specified.</p>
</div>
<div class="refsect1">
<div class="refsect1title">Examples</div>
<a name="ex_urlrewrite_create_regex_rule" />
<div class="example">
<div class="exampletitle" />
<p />
<div>
<pre class="screen">
DB.DBA.URLREWRITE_CREATE_REGEX_RULE (
'demo_nw_rule2',
1,
'(/[^#]*)',
vector('path'),
1,
'/sparql?query=CONSTRUCT+{+%%3Chttp%%3A//^{URIQADefaultHost}^%U%%23this%%3E+%%3Fp+%%3Fo+}+FROM+%%3Chttp%%3A//^{URIQADefaultHost}^/Northwind%%3E+WHERE+{+%%3Chttp%%3A//^{URIQADefaultHost}^%U%%23this%%3E+%%3Fp+%%3Fo+}&format=%U',
vector('path', 'path', '*accept*'),
null,
'(text/rdf.n3)|(application/rdf.xml)',
0,
null
);
</pre>
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