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<pre>
<i>options</i> ::= [<b>"i" "n" "r" "U"</b>]* (<b>"-"</b> [<b>"i" "n" "r" "U"</b>]*)?
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Options allow compile time options to be turned on/off for particular parts of the 
regular expression. The options equate to several compile time options specified to
the regcomp API function. If the option is specified in the first section, it is
turned on. If it is specified in the second section (after the <tt>-</tt>), it is
turned off.
<ul>
<li>i - Case inse