Text Commands: /search(/who) Subcommands
Subcommands can be used to filter the search with multiple filter categories, as below.
/search invite MRD CNJ 5<10 Ul'dah
(Search for level 5 to level 10 marauders and conjurers in Ul'dah who are seeking a party.)

The subcommands do not need to be in any particular order. For example, the above text command could also be written as below without any change to the search results.
/search 5<10 Ul'dah MRD invite CNJ

Further, multiple items can be specified within a filter category.
/search GLA PGL DOM
(Search for gladiators, pugilists, and Disciples of Magic [conjurers and thaumaturges].)

If overlapping or conflicting search filters are used, only the first filter is applied. For example, the two commands below will return the same results.
/search GLA PGL GLA
/search GLA PGL
(Search for gladiators and pugilists.)

Category Item Subcommand
Online Status
No filtering for online status when omitted.
Online online
Wants to join party invite
Member of a party party
Class
No filtering for class when omitted.
Gladiator GLA
Pugilist PGL
Marauder MRD
Lancer LNC
Archer ARC
Disciples of War (all of the five classes above) DOW
Conjurer CNJ
Thaumaturge THM
Disciples of Magic (both of the above classes) DOM
Carpenter WDK
Blacksmith BSM
Armorer ARM
Goldsmith GSM
Leatherworker LTW
Weaver WVR
Alchemist ALC
Culinarian CUL
Disciples of the Hand (all of the eight classes above) DOH
Miner MIN
Botanist BTN
Fisher FSH
Disciples of the Land (all of the three classes above) DOL
Level
When ommitted, search will return characters within five levels of player's own level.
Specify a single level only Enter a number value
Specify a range from X to Y X-Y
or
X<Y
Job
No filtering for job when omitted.
Filter for players who have learned a job JOB
Grand Company
No filtering for Grand Company affiliation when omitted.
The Maelstrom GCL
The Order of the Twin Adder GCG
The Immortal Flames GCU
No affiliation GCN
Area
Enter the area name as listed to the right. No filtering for area when omitted.
La Noscea
Include all areas listed to the right
La Noscea
Limsa Lominsa
Lower La Noscea
Western La Noscea
Eastern La Noscea
Upper La Noscea
The Cieldalaes
Mistbeard Cove
Cassiopeia Hollow
Shposhae
U'Ghamaro Mines
Strait of Merlthor
Locke's Lie
Turtleback Island
The Black Shroud
Include all areas listed to the right
The Black Shroud
Gridania
Central Shroud
East Shroud
North Shroud
West Shroud
South Shroud
Mun-Tuy Cellars
The Tam-Tara Deepcroft
The Thousand Maws of Toto-Rak
Thanalan
Include all areas listed to the right
Thanalan
Ul'dah
Central Thanalan
Eastern Thanalan
Western Thanalan
Northern Thanalan
Southern Thanalan
Nanawa Mines
Copperbell Mines
Cutter's Cry
Coerthas
Include all areas listed to the right
Coerthas
Coerthas Central Highlands
Coerthas Eastern Highlands
Coerthas Eastern Lowlands
Coerthas Central Lowlands
Coerthas Western Highlands
Dzemael Darkhold
The Aurum Vale
Rivenroad
Mor Dhona
Include all areas listed to the right
Mor Dhona
Transmission Tower
Language
No filtering for language(s) spoken when omitted.
Japanese JA
English EN
French FR
German DE