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tbd. Thorsten Letschert

An expression is an operation that evaluates its value, it is a combination of one or more constants, variables, functions, and operators that return another value.

3 + 4 
#Is an expression which evaluates to 7, with 3 and 4 being two constants

4 ≠ 4
#This expression evaluates to false

Basic elements

The table below lists all simple elements or operands that can be used in an expression.

Element	Description	Example
	A boolean value of `true` or `false`	true, TRUE, false, FALSE
	A quoted text or a text field code.	"This is a text"
	Text lists are enclosed by square brackets. Not only literals can be used as elements, but also field codes.	["first element", "second element", %{issue.summary}]
	A numeric value or a numeric field code.	3
	Number lists are enclosed by square brackets. Not only literals can be used as elements, but also field codes.	[5.1326, 3, 100000001, {issue.labels.length}]
	A specific value for comparisons if a field or another value is not set or equals null.	null
	A specific time period: from `SECOND` to `YEAR` (in capital letters) in milliseconds	MINUTE, DAY, WEEK, MONTH
	The weekdays in capital letters (`MONDAY`-`SUNDAY`) - internally represented by a number	TUESDAY
	The months in capital letters (JANUARY-DECEMBER) - internally represented by a number	JUNE

Field codes
Operators
Functions

Field codes are the heart.... and return different data types

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Ultimately, what can be used in an expression depends on the parsing mode-→

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