Regible is a rare word that is seldom used in everyday language. However, there are several synonyms that can be used instead to convey a similar meaning. "Readable", for instance, describes something that can be deciphered or comprehended easily. "Legible" is another synonym that refers to text or handwriting that is clear and able to be understood. Additionally, one can use "comprehensible" to describe information or text that is easily grasped or understood by others. "Intelligible" is a synonym that indicates something that is clear and logical in its presentation, making it easily discernible. These synonyms help express the idea of something being clear, comprehensible, and easily understood, which can be used as substitutes to regible.