-escape.
For example, a literal '<code class="Code prettyprint">*</code>' would be written as "<code class="Code prettyprint">\\*</code>" and a 
literal '<code class="Code prettyprint">\</code>' would be written as "<code class="Code prettyprint">\\</code>".  This is basically 
the same as what you would need to write if constructing the string in Java code.
</p> 
<p> 
For more information on these types of patterns, see the descriptions of 
<a href="/reference/android/os/PatternMatcher.html#PATTERN_LITERAL