Package TWiki::Search 
This module implements all the search functionality.
Constructor for the singleton Search engine object.
  StaticMethod getTextPattern ($text,$pattern) 
Sanitise search pattern - currently used for 
FormattedSearch only
Search one or more webs according to the parameters.
If 
_callback is set, that means the caller wants results as
soon as they are ready. =_callback_ should be set to a reference
to a function which takes 
_cbdata as the first parameter and
remaining parameters the same as 'print'.
If 
_callback is set, the result is always undef. Otherwise the
result is a string containing the rendered search results.
If 
inline is set, then the results are 
not decorated with
the search template head and tail blocks.
SMELL: If 
format is set, 
template will be ignored.
SMELL: If 
regex is defined, it will force type='regex'
SMELL: If 
template is defined 
bookview will not work
SMELL: it seems that if you define 
_callback or 
inline then you are
	responsible for converting the TML to HTML yourself!
FIXME: 
callback cannot work with format parameter (consider format='| $topic |'