Takes the inline CSS duotone variable from a block and return the slug.

Description

Handles styles slugs like: var:preset|duotone|blue-orange var(–wp–preset–duotone–blue-orange)

Parameters

$duotone_attrstringrequired

The duotone attribute from a block.

Return

Source

private static function get_slug_from_attribute( $duotone_attr ) {
	// Uses Branch Reset Groups `(?|…)` to return one capture group.
	preg_match( '/(?|var:preset\|duotone\|(\S+)|var\(--wp--preset--duotone--(\S+)\))/', $duotone_attr, $matches );

	return ! empty( $matches[1] ) ? $matches[1] : '';
}

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