\d*\.?\d+)(?Ppt|px|em)?$/i'; protected bool $valid = false; protected string $size = ''; protected string $unit = ''; public function __construct(string $size) { if (1 === preg_match(self::REGEXP_SIZE_VALIDATION, $size, $matches)) { $this->valid = true; $this->size = $matches['size']; $this->unit = $matches['unit'] ?? 'pt'; } } public function valid(): bool { return $this->valid; } public function size(): string { return $this->size; } public function unit(): string { return $this->unit; } public function __toString(): string { return $this->size . $this->unit; } }