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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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@ -326,8 +326,9 @@ 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.
Should you need to search for a string with a leading equals or tilde, prefix the string with a backslash.
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
for the tag ``Science Fiction``, you would need to search for ``tag:"=science fiction"``. If you search for