Pattern

A value constraint type of Pattern means that the corresponding value constraint is to be interpreted as a (Python) regular expression. If value constraints are empty or malformed as regular expressions they will be passed through, untouched, to the text, JSON, and YAML outputs. If a pattern does not correctly compile as a Python regular expression (or is empty), a warning will be emitted.

shapeID	propertyID	valueConstraint	valueConstraintType
:ex1	:status	approved_*	Pattern
:ex2	:status		Pattern
:ex3	:status	approved_(*	Pattern
:ex4	:status	/approved_*/	Pattern
:ex5	:status	^2020 August	Pattern

This is interpreted as:

DCTAP instance
    Shape
        shapeID                  :ex1
        Statement Template
            propertyID           :status
            valueConstraint      approved_*
            valueConstraintType  pattern
    Shape
        shapeID                  :ex2
        Statement Template
            propertyID           :status
            valueConstraintType  pattern
    Shape
        shapeID                  :ex3
        Statement Template
            propertyID           :status
            valueConstraint      approved_(*
            valueConstraintType  pattern
    Shape
        shapeID                  :ex4
        Statement Template
            propertyID           :status
            valueConstraint      /approved_*/
            valueConstraintType  pattern
    Shape
        shapeID                  :ex5
        Statement Template
            propertyID           :status
            valueConstraint      ^2020 August
            valueConstraintType  pattern

WARNING [:ex2/valueConstraint] Value constraint type is 'pattern', but value constraint is empty.
WARNING [:ex3/valueConstraint] Value constraint type is 'pattern', but 'approved_(*' is not a valid regular expression.