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Add discussion about doubled backslashes for escaping chars in search query regular expressions

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Charles Haley 2011-06-07 15:46:05 +01:00
parent 51e192f097
commit 5b17f850cd
1 changed files with 3 additions and 2 deletions
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src/calibre/manual/gui.rst
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@ -326,7 +326,8 @@ Two other kinds of searches are available: equality search and search using regu
Equality searches are indicated by prefixing the search string with an equals sign (=). For example, the query
``tag:"=science"`` will match "science", but not "science fiction" or "hard science". Regular expression searches are
indicated by prefixing the search string with a tilde (~). Any python-compatible regular expression can
be used. Regular expression searches are contains searches unless the expression contains anchors.
be used. Note that backslashes use to escape special characters in reqular expressions must be doubled, because single backslashes will be removed during query parsing. For example, to match a literal parenthesis, you must enter ``\\(``. Regular expression searches are contains searches unless the expression contains anchors.
Should you need to search for a string with a leading equals or tilde, prefix the string with a backslash.
Enclose search strings with quotes (") if the string contains parenthesis or spaces. For example, to search