Returns the pattern node of the JS RegExp of a given node.
This operation is guaranteed to always success for all node types except for flags nodes. Flags nodes have an
optional parent which, if not set, means that this function can't access the pattern node. If the function can't
access the pattern node from a flags node, an error will be thrown.
Returns the pattern node of the JS RegExp of a given node.
This operation is guaranteed to always success for all node types except for flags nodes. Flags nodes have an optional
parentwhich, if not set, means that this function can't access the pattern node. If the function can't access the pattern node from a flags node, an error will be thrown.