1 Pa. C.S. § 1924 : Consolidated Statutes — GENERAL PROVISIONS — STATUTORY CONSTRUCTION — RULES OF CONSTRUCTION — CONSTRUCTION OF STATUTES — Construction of titles, preambles, provisos, exceptions and headings

The title and preamble of a statute may be considered in the construction thereof. Provisos shall be construed to limit rather than to extend the operation of the clauses to which they refer. Exceptions expressed in a statute shall be construed to exclude all others. The headings prefixed to titles, parts, articles, chapters, sections and other divisions of a statute shall not be considered to control but may be used to aid in the construction thereof.