Notes:
*- mainhand and offhand work in getinfo:<slot>*
*- give and remove placeholders are DISABLED by default for security purposes. See PlaceholderAPI config.yml file to enable.*

Modifiers
You can combine different modifiers to check for different values.
Available modifiers are:

namecontains:<text>

Checks if the item's display name contains <text>* \\ ~

namestartswith:<text>

Checks if the item's display name starts with <text>* \\ ~

nameequals:<text>

Checks if the item's display name equals <text>* \\ ^ ~

mat:<material>

Checks if the item is <material> (For example: STONE) ^ ~

amt:<number>

Checks if the player has <number> of items ^ ~

data:<number>

Checks if the item has data <number> (Example: Red wool has 14 as data (WOOL:14)).
This is only for 1.12 and older! ^ ~

custommodeldata:<number>

Checks if the item has CustomModelData <number>
This is only for 1.14 and newer! ^ ~

lorecontains:<text>

Checks if the item's lore contains <text>* ~
***Combined with getinfo you can specify a number for <text> and the specific lore line will be returned***

loreequals:<text>

Checks if the item's lore equals <text> Lines are separated by | ^ ~
***Combined with getinfo you can specify a number for <text> and the specific lore line will be returned***

matcontains:<text>

Checks if the item's material contains <text>*

enchantments:<enchantment=lvl>;<enchantment>

Checks if the item's enchantments contains <enchantment> with an optional =level
Uses vanilla minecraft enchantment names ^ ~

enchanted

Checks if the item is enchanted (with anything) ~

potiontype:<potiontype>

Checks if the item has the potiontype (Click here for potion types) ^ ~

potionextended:<boolean>

Checks if a potion is extended ^ ~

potionupgraded:<boolean>

Checks if a potion is upgraded ^ ~

strict

Requires mat: modifier. Strictly checks the name and lore for an item. (If a Stone named Test is in your inventory, and you're using %checkitem_mat:stone,strict%, it will return false)

inhand

Check if the item is in the player's hand. inhand will check both hands. You can add :main or :off to specify. (Ex: inhand:main)

inslot:<number>

Check if the item is in a specific slot (Click here for valid slots)

nbtstrings:<key>=<value>;<key>=<value>

Checks if the item's nbtStrings contains <key> with the value of <value>. * ^ ~

nbtints:<key>=<value>;<key>=<value>

Checks if the item's nbtInts contains <key> with the value of <value>. * ^ ~

*For nbt data you can use compounds by putting .. inside your string Example (%checkitem_nbtstrings:PublicBukkitValues..executableitems:ei-id=Free_Money%)* ^

Notes:

\* means case-sensitive
** means only one can be used
^ means that the modifier supports the give placeholder
~ means that the modifier works with the getinfo placeholder
To use Commas in strings you must escape them using \ (Ex: loreequals:Milk\, Eggs\, Bread)
**Placeholders are supported, but they need to be in brackets! (Ex: %player_name% would be {player_name}**

PlaceholderAPI Placeholders