<dfn>Figure 1:</dfn>The control flow through the rewriting ruleset
</p>
<p>As you can see, first the URL is matched against the
<em>Pattern</em> of each rule. When it fails mod_rewrite
immediately stops processing this rule and continues with the
next rule. If the <em>Pattern</em> matches, mod_rewrite looks
for corresponding rule conditions. If none are present, it
just substitutes the URL with a new value which is
constructed from the string <em>Substitution</em> and goes on
with its rule-looping. But if conditions exist, it starts an
inner loop for processing them in the order that they are
listed. For conditions the logic is different: we don't match
a pattern against the current URL. Instead we first create a
string <em>TestString</em> by expanding variables,
back-references, map lookups, <em>etc.</em> and then we try
to match <em>CondPattern</em> against it. If the pattern
doesn't match, the complete set of conditions and the
corresponding rule fails. If the pattern matches, then the
next condition is processed until no more conditions are
available. If all conditions match, processing is continued
with the substitution of the URL with
<em>Substitution</em>.</p>
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