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Tips
Separate words with a space. All words have to match as substrings. 
'OR', grouping with parenthesis, string-quoting and some glob-style wildcard
characters are also supported. 
To exclude words from a title search or full text search, prepend a '-'. 
Use '^xx' or 'xx*' to match words starting with 'xx'. 
Use '*xx' or 'xx$' to match words ending with 'xx'. 
Use '^word$' to match exact words. 
Use regex=auto and 're:' like 're:word.*xx' or regex=posix to use posix regular expressions. (not yet) 
Use regex=auto and '//' like '/^word$/' or regex=pcre to match using perl-style regular expressions. 
Use regex=sql to match using SQL-style wildcards '%' and '_'. 
Use regex=none to match any wildcards verbatim. 
Example: 'wiki text -php' looks for all pages containing the words 'wiki' and 'text',  
but not containing the word 'php'.