The pattern can contain any text you wish, in addition to field markers that indicate that a specific field of the entry should be inserted at that position of the key. A field marker generally consists of the field name enclosed in square braces, e.g. [volume]. If the field is undefined in an entry at the time of key generation, no text will be inserted by the field marker.
Several special field markers are offered, which extract only a specific part of a field. These are listed below. Feel free to suggest new special field markers.
Special field markers:
The default key pattern is [auth]_[year], and this could produce
keys like e.g. Yared_1998 If the key is not unique in the
current database, it is made unique by adding one of the letters a-z
until a unique key is found. Thus, the labels might look like:
Yared_1998
Yared_1998a
Yared_1998b