pat:
(<[A|a]\sHREF='.*[^']).*(>.*</[A|a]>)
rep:<LI>$1$2</LI>
 <DT>(<A HREF='.*)[\077](.*[^'])(['].*>.*</A>) $1$3 loose ?...

insensitive, global, multiline
set [a-z0-9] (or|if) 
\d igit, \s pacewhite \S not \b eginword \B not
.anychar~\nl \w ordchar \W ordnot \xdd hex
\0 null, \n ewline, \f ormfeed, \r eturn, \t ab, \v vtab, 
+{1,} *{0,} ?{0,1} {min,max}  {count} 

http://\S+ with <a href="$&">$&</a> to turn all URLs in a file into HTML


regexp \b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b  email
^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$  only
$&


var str = "Visit Reason";
var n = str.search(/Reason/i);

var	str = "Visit Microsoft!";
var res = str.replace(/microsoft/i, "Reason");

var str = "Visit Microsoft!";
var res = str.replace("Microsoft", "Reason");

var patt = /e/;
patt.test("The best things in life are free!");
/e/.test("The best things in life are free!");
/e/.exec("The best things in life are free!");