<dd>Replace all instances of /<em>pattern</em>/ on each
addressed line, not just the first instance.</p></dd>
+ <dt><b>I</b></dt>
+ <dd>Matching is case-insensitive.<p></p></dd>
+
<dt><b>p</b></dt>
<dd>Print the line if a successful substitution is done. If several
successful substitutions are done, multiple copies of the line will be