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# Global Search Queries
This page documents search queries as understood by our xapian search engine (aka "the global search").
General xapian search query syntax is documented on the xapian website: [https://getting-started-with-xapian.readthedocs.io/en/latest/concepts/search/queryparser.html](https://getting-started-with-xapian.readthedocs.io/en/latest/concepts/search/queryparser.html).
The specifics of GeneNetwork's use of xapian differs slightly in the choice of prefixes and special syntax such as the synteny search. The examples below may help to illustrate it.
### Free text search
Search for the term "cytochrome" in the free text.
`cytochrome`
Search for the term "cytochrome" and the term "P450" in the free text (only results that have both are shown):
`cytochrome AND P450`
Search for occurrences of the term "cytochrome" near the term "P450" in the free text:
`cytochrome NEAR P450`
Search for the term "cytochrome" in the free text but exclude results that have the term "P450":
`cytochrome -P450`
`cytochrome NOT P450`
### Boolean filtering
Search for results pertaining to the human species:
`species:human`
Search for results pertaining to the BXD group:
`group:BXD`
or
`group:bxd`
The above search is case-insensitive.
Search for results pertaining to chromosome 11:
`chr:11`
Search for results pertaining to the BXD group and chromosome 11:
`group:BXD AND chr:11`
### Boolean filtering using numerical ranges
Search for results with mean between 5 and 7:
`mean:5..7`
Search for results with mean less than 5:
`mean:..5`
Search for results with mean greater than 7:
`mean:7..`
### RIF/WIKI search
To do a RIF search you can use the prefixes: `RIF:` or `rif:`. Here are some searches you can try out:
```
rif:Brca2
rif:Brca2 mean:2.4..2.404
rif:isoneuronal mean:12.103..12.105
rif:glioma symbol:shh
rif:diabetes
```
To do a WIKI search you can use the prefixes: `WIKI:` or `wiki:`. Here are some example searches:
```
wiki:nicotine
wiki:nicotine mean:12.103..12.105
wiki:addiction species:mouse
wiki:nicotine symbol:shh
wiki:glioma species:mouse group:bxd dataset:hc_m2_0606_p
```
### Synteny search
Search for results near (+/- 50 kbases) base 9930021 of chromosome 4 of the human species and syntenic locations in other species:
`Hs:chr4:9930021`
Search for results near (+/- 50 kbases) base 9930021 of chromosome 4 of the human species and syntenic locations in mouse alone:
`Hs:chr4:9930021 species:mouse`
Search for results between base 9130000 and 9980000 of chromosome 4 of the human species and syntenic locations in mouse alone:
`Hs:chr4:9130000..9980000 species:mouse`
Alternatively, this same query may be expressed using kilo or mega suffixes:
```
Hs:chr4:9130k..9980k species:mouse
Hs:chr4:9.13M..9.98M species:mouse
```
### Gotchas
#### Pure \`NOT\` queries are not supported
Due to [performance reasons,](https://xapian.org/docs/apidoc/html/classXapian_1_1QueryParser.html#ae96a58a8de9d219ca3214a5a66e0407eacafc7c8cf7c90adac0fc07d02125aed0) pure `NOT` queries are not supported.
A search such as: `NOT author:hager` will fail.
You will need to add something to the query to prevent the error, e.g.
`species:mouse NOT author:hager`
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