this regx @"^(?:\s*)((?:[a-zA-Z]+[\s-]?)+[a-zA-Z]+)(?:\s*)$ is taking long time

This regx @"^(?:\s*)((?:[a-zA-Z]+[\s-]?)+[a-zA-Z]+)(?:\s*)$ is taking so long time. In some complex cases, it is horrible. can you please how can optimize this regx. Using for c# development in Web Application.